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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Treasury Stock
Retained Earnings
Accumulated Other Non-Owner Changes to Equity
Balance at Dec. 31, 2015 $ 1,127,753 $ 621 $ 427,558 $ (226,421) $ 1,069,247 $ (143,252)
Balance (in shares) at Dec. 31, 2015   62,071,000   8,207,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Comprehensive income 78,025       135,601 (57,576)
Dividends paid (27,435)       (27,435)  
Common stock repurchases (20,520)     $ (20,520)    
Cumulative effect of change in accounting guidance (Note 12) 198       198  
Common stock repurchases (in shares)       550,994    
Employee stock plans 10,337 $ 6 15,677 $ (4,886) (460)  
Employee stock plans (in shares)   621,259   132,000    
Balance at Dec. 31, 2016 1,168,358 $ 627 443,235 $ (251,827) 1,177,151 (200,828)
Balance (in shares) at Dec. 31, 2016   62,692,000   8,890,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Comprehensive income 153,844       59,415 94,429
Dividends paid (29,551)       (29,551)  
Common stock repurchases (40,791)     $ (40,791)    
Common stock repurchases (in shares)       677,100    
Employee stock plans 8,461 $ 3 14,130 $ (5,380) (292)  
Employee stock plans (in shares)   341,837   89,000    
Balance at Dec. 31, 2017 1,260,321 $ 630 457,365 $ (297,998) 1,206,723 (106,399)
Balance (in shares) at Dec. 31, 2017   63,034,000   9,656,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Comprehensive income 101,416       166,186 (64,770)
Dividends paid (32,206)       (32,206)  
Common stock repurchases (138,275)     $ (138,275)    
Reclassification pursuant to accounting guidance related to U.S. Tax Reform (Note 1) 0       19,331 (19,331)
Cumulative effect of change in accounting guidance (Note 12) 4,295       4,295  
Common stock repurchases (in shares)       2,292,100    
Employee stock plans 7,505 $ 4 13,453 $ (5,395) (557)  
Employee stock plans (in shares)   332,893   86,000    
Balance at Dec. 31, 2018 $ 1,203,056 $ 634 $ 470,818 $ (441,668) $ 1,363,772 $ (190,500)
Balance (in shares) at Dec. 31, 2018   63,367,000   12,034,000