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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Common Stock Held in Treasury
Balance at beginning of period (shares) at Dec. 31, 2017   49,276       2,362
Balance at beginning of period (value) at Dec. 31, 2017 $ 1,475,333 $ 493 $ 1,220,356 $ 494,457 $ (111,877) $ (128,096)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Shares issued under share-based compensation plan (shares)           (22)
Shares issued under share-based compensation plan (value) 0   (1,240)     $ 1,240
Share-based compensation expense (value) 1,375   1,375      
Net income 41,635     41,635    
Cash dividends ($0.25 and $0.22 per share, respectively) (10,245)     (10,245)    
Currency translation adjustment 21,834       21,834  
Repurchases of treasury stock (shares)           1,378
Repurchases of treasury stock (value) (105,646)         $ (105,646)
Balance at end of period (shares) at Mar. 31, 2018   49,276       3,718
Balance at end of period (value) at Mar. 31, 2018 1,424,286 $ 493 1,220,491 525,847 (90,043) $ (232,502)
Balance at beginning of period (shares) at Dec. 31, 2018   49,276       5,673
Balance at beginning of period (value) at Dec. 31, 2018 1,318,104 $ 493 1,224,608 606,810 (113,117) $ (400,690)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Shares issued under share-based compensation plan (shares)           (21)
Shares issued under share-based compensation plan (value) 0   (1,441)     $ 1,441
Share-based compensation expense (value) 2,315   2,315      
Net income 42,655     42,655    
Cash dividends ($0.25 and $0.22 per share, respectively) (10,891)     (10,891)    
Currency translation adjustment 5,423       5,423  
Repurchases of treasury stock (shares)           343
Repurchases of treasury stock (value) (29,190)         $ (29,190)
Balance at end of period (shares) at Mar. 31, 2019   49,276       5,995
Balance at end of period (value) at Mar. 31, 2019 $ 1,328,416 $ 493 $ 1,225,482 $ 638,574 $ (107,694) $ (428,439)