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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Preferred Stock
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, 2016   0 49,276       769
Balance at beginning of period (value) at Dec. 31, 2016 $ 1,449,986 $ 0 $ 493 $ 1,217,969 $ 387,401 $ (119,806) $ (36,071)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued under share-based compensation plan (shares)     0       (10)
Shares issued under share-based compensation plan (value) 0   $ 0 (440)     $ 440
Exercise of stock options (shares)             (13)
Exercise of stock options (value) 307     (242)     $ 549
Share-based compensation expense (value) 2,302     2,302      
Net income 76,158       76,158    
Dividends paid (27,400)       (27,400)    
Currency translation adjustment 31,361         31,361  
Repurchases of treasury stock (shares)             1,182
Repurchases of treasury stock (value) (65,035)           $ (65,035)
Balance at end of period (shares) at Sep. 30, 2017   0 49,276       1,928
Balance at end of period (value) at Sep. 30, 2017 1,467,679 $ 0 $ 493 1,219,589 436,159 (88,445) $ (100,117)
Balance at beginning of period (shares) at Dec. 31, 2017   0 49,276       2,362
Balance at beginning of period (value) at Dec. 31, 2017 1,475,333 $ 0 $ 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)     0       (22)
Shares issued under share-based compensation plan (value) 0   $ 0 (1,240)     $ 1,240
Exercise of stock options (shares)     0       (10)
Exercise of stock options (value) 400   $ 0 (294)     $ 694
Share-based compensation expense (value) 4,125     4,125      
Net income 105,131       105,131    
Dividends paid (29,897)       (29,897)    
Currency translation adjustment 13,907         13,907  
Repurchases of treasury stock (shares)             3,114
Repurchases of treasury stock (value) (257,271)           $ (257,271)
Balance at end of period (shares) at Sep. 30, 2018   0 49,276       5,444
Balance at end of period (value) at Sep. 30, 2018 $ 1,311,728 $ 0 $ 493 $ 1,222,947 $ 569,691 $ (97,970) $ (383,433)