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Consolidated Statements of Changes in Stockholders' Equity (USD $)
In Thousands, except Share data
Total
Common Stock
Treasury Stock
Additional Paid in Capital
Retained Earnings
Accumulated Other Comprehensive (Loss)
Beginning Balance at Dec. 31, 2009 $ 898,845 $ 1,030   $ 387,496 $ 546,355 $ (36,036)
Beginning Balance (in shares) at Dec. 31, 2009   103,018,358        
Common stock repurchases and retirements (in shares)   (1,665,392)        
Common stock repurchases and retirements (40,851) (17)   (40,834)    
Common stock dividends declared (61,679)       (61,679)  
Restricted stock grants and cancellations (in shares)   560,845        
Restricted stock grants and cancellations 513 6   507    
Exercise of stock options (in shares) 394,420 394,420        
Exercise of stock options 8,037 4   8,033    
Share-based compensation expense 7,006     7,006    
Other 40     40    
Comprehensive income 197,090       205,435 (8,345)
Ending Balance at Dec. 31, 2010 1,009,001 1,023   362,248 690,111 (44,381)
Ending Balance (in shares) at Dec. 31, 2010   102,308,231        
Common stock repurchases and retirements (in shares)   (4,896,666) (2,355)      
Common stock repurchases and retirements (123,077) (49) (59) (29,098) (93,871)  
Common stock dividends declared (80,307)       (80,307)  
Restricted stock grants and cancellations (in shares)   569,724        
Restricted stock grants and cancellations 512 6   506    
Exercise of stock options (in shares) 343,685 343,685        
Exercise of stock options 7,736 3   7,733    
Share-based compensation expense 9,736     9,736    
Other 679     679    
Comprehensive income 104,630       158,027 (53,397)
Ending Balance at Dec. 31, 2011 928,910 983 (59) 351,804 673,960 (97,778)
Ending Balance (in shares) at Dec. 31, 2011   98,324,974 (2,355)      
Common stock repurchases and retirements (in shares)   (1,510,014) 2,355      
Common stock repurchases and retirements (45,162) (15) 59 (9,282) (35,924)  
Common stock dividends declared (98,128)       (98,128)  
Restricted stock grants and cancellations (in shares)   382,953        
Restricted stock grants and cancellations 1,615 4   1,611    
Exercise of stock options (in shares) 944,869 944,869        
Exercise of stock options 22,297 9   22,288    
Share-based compensation expense 11,687     11,687    
Other 686     686    
Comprehensive income 147,556       163,820 (16,264)
Ending Balance at Dec. 31, 2012 $ 969,461 $ 981   $ 378,794 $ 703,728 $ (114,042)
Ending Balance (in shares) at Dec. 31, 2012   98,142,782