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Shareholders' Equity, Stock Options and Net Income per Share - Common and Preferred Stock (Details) (USD $)
In Thousands, except Share data, unless otherwise specified |
12 Months Ended | 12 Months Ended | 12 Months Ended | 3 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2011
Preferred Stock [Member]
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Dec. 31, 2011
Common Stock [Member]
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Dec. 31, 2010
Common Stock [Member]
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Dec. 31, 2009
Common Stock [Member]
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Dec. 31, 2008
Common Stock [Member]
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May 31, 2008
Common Stock [Member]
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Dec. 31, 2011
Employee Stock Option [Member]
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Mar. 31, 2012
Common Stock [Member]
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| Preferred Stock [Abstract] | |||||||||||
| Preferred stock, shares authorized | 5,000,000 | 5,000,000 | 5,000,000 | ||||||||
| Preferred stock par value per share | $ 0.01 | $ 0.01 | $ 0.01 | ||||||||
| Cash Dividends [Abstract] | |||||||||||
| Quarterly cash dividend per share, common stock | $ 0.07 | $ 0.07 | $ 0.07 | $ 0.07 | |||||||
| Share repurchase program, authorized shares | 2,000,000 | ||||||||||
| Repurchase of Common Stock [Abstract] | |||||||||||
| Stock Repurchased During Period, Shares | 973,768 | ||||||||||
| Repurchase of common stock (repurchase program) | $ 26,101 | $ 0 | $ 0 | $ 26,101 | |||||||
| Treasury stock acquired, average cost per share | $ 26.80 | ||||||||||
| Remaining shares authorized under share repurchase program | 815,059 | ||||||||||
| Share-based Compensation [Abstract] | |||||||||||
| Number of shares authorized under the plan | 7,500,000 | 4,500,000 | |||||||||
| Term of options issued under the plan, minimum | 7 | ||||||||||
| Term of options issued under the plan, maximum | 10 | ||||||||||
| Option award vesting period, minimum | 1 | ||||||||||
| Option award vesting period, maximum | 5 | ||||||||||
| Additional authorized shares for employee stock awards | 3,000,000 | ||||||||||
| X | ||||||||||
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- Definition
Additional authorized shares for employee stock options No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Quarterly Cash Dividen per Share, Common Stock No definition available.
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| X | ||||||||||
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- Definition
Number of shares approved for repurchase No definition available.
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| X | ||||||||||
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- Definition
shares repurchase program, remaining shares authorized for repurchase. Number of shares originally authorized net of repurchases to date. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The cash outflow to reacquire common stock during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The maximum vesting term over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition. No definition available.
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| X | ||||||||||
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- Definition
The minimum vesting term over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition. No definition available.
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| X | ||||||||||
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- Definition
The maximum period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. No definition available.
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| X | ||||||||||
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- Definition
The minimum period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. No definition available.
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| X | ||||||||||
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- Definition
The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total cost of shares repurchased divided by the total number of shares repurchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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