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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) 0     (549)     $ 549
Share-based compensation expense (value) 776     776      
Net income 32,645       32,645    
Dividends paid (9,172)       (9,172)    
Currency translation adjustment 23,005         23,005  
Repurchases of treasury stock (shares)             228
Repurchases of treasury stock (value) (10,005)           $ (10,005)
Balance at end of period (shares) at Mar. 31, 2017   0 49,276       974
Balance at end of period (value) at Mar. 31, 2017 1,487,235 $ 0 $ 493 1,217,756 410,874 (96,801) $ (45,087)
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
Share-based compensation expense (value) 1,375     1,375      
Net income 41,635       41,635    
Dividends paid (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   0 49,276       3,718
Balance at end of period (value) at Mar. 31, 2018 $ 1,424,286 $ 0 $ 493 $ 1,220,491 $ 525,847 $ (90,043) $ (232,502)