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Condensed Consolidated Statements Of Stockholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock
Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Treasury Stock
Beginning Balance at Dec. 31, 2012 $ 753,643 $ 876 $ 204,449 $ 1,020,543 $ (109,913) $ (362,312)
Beginning Balance (in shares) at Dec. 31, 2012   69,204,000        
Increase (Decrease) in Stockholders' Equity            
Net issuance of treasury stock for vested restricted stock units, including tax benefit (in shares)   76,000        
Repurchases of common stock (in shares)   (5,831,000)        
Net income 84,962     84,962    
Other comprehensive loss (9,969)       (9,969)  
Dividends declared on common stock (18,144)     (18,144)    
Stock compensation expense 4,354   4,354      
Net issuance of treasury stock for vested restricted stock units, including tax benefit (1,608)   (286)     (1,322)
Repurchases of common stock (265,340)         (265,340)
Ending Balance at Jun. 30, 2013 547,898 876 208,517 1,087,361 (119,882) (628,974)
Ending Balance (in shares) at Jun. 30, 2013   63,449,000        
Beginning Balance at Dec. 31, 2013 713,843 876 212,822 1,169,754 (38,119) (631,490)
Beginning Balance (in shares) at Dec. 31, 2013   63,415,000        
Increase (Decrease) in Stockholders' Equity            
Net issuance of treasury stock for vested restricted stock units, including tax benefit (in shares)   153,000        
Repurchases of common stock (in shares) (158,204) (158,000)        
Net income 75,479     75,479    
Other comprehensive loss (6,294)       (6,294)  
Dividends declared on common stock (19,356)     (19,356)    
Stock compensation expense 5,951   5,951      
Net issuance of treasury stock for vested restricted stock units, including tax benefit (4,230)   (628)     (3,602)
Repurchases of common stock (7,735)         (7,735)
Ending Balance at Jun. 30, 2014 $ 757,658 $ 876 $ 218,145 $ 1,225,877 $ (44,413) $ (642,827)
Ending Balance (in shares) at Jun. 30, 2014   63,410,000