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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, 2018   49,276       5,673
Balance at beginning of period 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 0   (1,441)     $ 1,441
Shares issued under share-based compensation plan (shares)           (21)
Share-based compensation expense 2,315   2,315      
Net income 42,655     42,655    
Cash dividends (10,891)     (10,891)    
Currency translation adjustment 5,423       5,423  
Purchases of treasury stock (shares)           343
Purchases of treasury stock (29,190)         $ (29,190)
Balance at end of period (shares) at Mar. 31, 2019   49,276       5,995
Balance at end of period at Mar. 31, 2019 1,328,416 $ 493 1,225,482 638,574 (107,694) $ (428,439)
Balance at beginning of period (shares) at Dec. 31, 2019   49,276       6,947
Balance at beginning of period at Dec. 31, 2019 1,350,035 $ 493 1,231,528 727,476 (96,969) $ (512,493)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Shares issued under share-based compensation plan (3,327)   (10,266)     $ 6,939
Shares issued under share-based compensation plan (shares)           (93)
Share-based compensation expense 2,851   2,851      
Net income 32,918     32,918    
Cash dividends (11,268)     (11,268)    
Currency translation adjustment (83,503)       (83,503)  
Purchases of treasury stock (shares)           981
Purchases of treasury stock (80,331)         $ (80,331)
Balance at end of period (shares) at Mar. 31, 2020   49,276       7,835
Balance at end of period at Mar. 31, 2020 $ 1,207,375 $ 493 $ 1,224,113 $ 749,126 $ (180,472) $ (585,885)