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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 | 2 Months Ended | 3 Months Ended | 12 Months Ended | 12 Months Ended | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2013
Preferred Stock [Member]
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Feb. 19, 2014
Common Stock [Member]
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Mar. 31, 2014
Common Stock [Member]
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Dec. 31, 2012
Common Stock [Member]
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Sep. 30, 2012
Common Stock [Member]
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Jun. 30, 2012
Common Stock [Member]
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Mar. 31, 2012
Common Stock [Member]
|
Dec. 31, 2013
Common Stock [Member]
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Dec. 31, 2011
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, 2013
Minimum [Member]
Employee Stock Option [Member]
|
Dec. 31, 2013
Maximum [Member]
Employee Stock Option [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 | $ 0.12 | $ 0.10 | $ 0.10 | $ 0.07 | $ 0.07 | $ 0.10 | $ 0.07 | |||||||||
| Repurchase of Common Stock [Abstract] | ||||||||||||||||
| Share repurchase program, authorized shares | 2,000,000 | 2,000,000 | ||||||||||||||
| Stock Repurchased During Period, Shares | 8,675 | 973,768 | ||||||||||||||
| Repurchase of common stock (repurchase program) | $ 354 | $ 0 | $ 26,101 | $ 354 | $ 26,101 | |||||||||||
| Treasury stock acquired, average cost per share | $ 40.84 | $ 26.80 | ||||||||||||||
| Remaining shares authorized under share repurchase program | 806,384 | |||||||||||||||
| Share-based Compensation [Abstract] | ||||||||||||||||
| Number of shares authorized under the plan | 7,500,000 | 4,500,000 | ||||||||||||||
| Expected life of options (in years) | 7 years | 10 years | ||||||||||||||
| Option award vesting period | 1 year | 5 years | ||||||||||||||
| Additional authorized shares for employee stock awards | 1,001,148 | 3,000,000 | ||||||||||||||