Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity, Stock Options and Net Income per Share - Common and Preferred Stock (Details)

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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
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2008
May 31, 2008
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      
Repurchase of Common Stock [Abstract]                  
Repurchase of common stock (repurchase program)         0 $ 26,101 $ 0    
Preferred Stock [Member]
                  
Preferred Stock [Abstract]                  
Preferred stock, shares authorized 5,000,000       5,000,000        
Preferred stock par value per share $ 0.01       0.01        
Common Stock [Member]
                  
Cash Dividends [Abstract]                  
Quarterly cash dividend per share, common stock $ 0.10 $ 0.10 $ 0.07 $ 0.07   $ 0.07 $ 0.07    
Repurchase of Common Stock [Abstract]                  
Share repurchase program, authorized shares         2,000,000        
Stock Repurchased During Period, Shares           973,768      
Repurchase of common stock (repurchase program)           $ 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       7,500,000     4,500,000  
Additional authorized shares for employee stock awards 1,232,000       1,232,000       3,000,000
Employee Stock Option [Member]
                  
Share-based Compensation [Abstract]                  
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