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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) 1,535     1,535      
Net income 47,884       47,884    
Dividends paid (18,348)       (18,348)    
Currency translation adjustment 36,342         36,342  
Repurchases of treasury stock (shares)             518
Repurchases of treasury stock (value) (26,274)           $ (26,274)
Balance at end of period (shares) at Jun. 30, 2017   0 49,276       1,264
Balance at end of period (value) at Jun. 30, 2017 1,491,432 $ 0 $ 493 1,218,822 416,937 (83,464) $ (61,356)
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) 2,750     2,750      
Net income 71,806       71,806    
Dividends paid (20,166)       (20,166)    
Currency translation adjustment (2,791)         (2,791)  
Repurchases of treasury stock (shares)             2,619
Repurchases of treasury stock (value) (217,288)           $ (217,288)
Balance at end of period (shares) at Jun. 30, 2018   0 49,276       4,949
Balance at end of period (value) at Jun. 30, 2018 $ 1,310,044 $ 0 $ 493 $ 1,221,572 $ 546,097 $ (114,668) $ (343,450)