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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, 2017   0 49,276       2,362
Balance at beginning of period 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 0     (1,240)     $ 1,240
Shares issued under share-based compensation plan (shares)             (22)
Share-based compensa-tion expense 1,375     1,375      
Net income 41,635       41,635    
Cash dividends (10,245)       (10,245)    
Currency translation adjustment 21,834         21,834  
Purchases of treasury stock (shares)             1,378
Purchases of treasury stock (105,646)           $ (105,646)
Balance at end of period (shares) at Mar. 31, 2018   0 49,276       3,718
Balance at end of period at Mar. 31, 2018 1,424,286 $ 0 $ 493 1,220,491 525,847 (90,043) $ (232,502)
Balance at beginning of period (shares) at Dec. 31, 2017   0 49,276       2,362
Balance at beginning of period 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]              
Net income 105,131            
Balance at end of period (shares) at Sep. 30, 2018   0 49,276       5,444
Balance at end of period at Sep. 30, 2018 1,311,728 $ 0 $ 493 1,222,947 569,691 (97,970) $ (383,433)
Balance at beginning of period (shares) at Mar. 31, 2018   0 49,276       3,718
Balance at beginning of period at Mar. 31, 2018 1,424,286 $ 0 $ 493 1,220,491 525,847 (90,043) $ (232,502)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Exercise of stock options 400     (294)     $ 694
Exercise of stock options (shares)             (10)
Share-based compensa-tion expense 1,375     1,375      
Net income 30,171       30,171    
Cash dividends (9,921)       (9,921)    
Currency translation adjustment (24,625)         (24,625)  
Purchases of treasury stock (shares)             1,241
Purchases of treasury stock (111,642)           $ (111,642)
Balance at end of period (shares) at Jun. 30, 2018   0 49,276       4,949
Balance at end of period at Jun. 30, 2018 1,310,044 $ 0 $ 493 1,221,572 546,097 (114,668) $ (343,450)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Share-based compensa-tion expense 1,375     1,375      
Net income 33,325       33,325    
Cash dividends (9,731)       (9,731)    
Currency translation adjustment 16,698         16,698  
Purchases of treasury stock (shares)             495
Purchases of treasury stock (39,983)           $ (39,983)
Balance at end of period (shares) at Sep. 30, 2018   0 49,276       5,444
Balance at end of period at Sep. 30, 2018 1,311,728 $ 0 $ 493 1,222,947 569,691 (97,970) $ (383,433)
Balance at beginning of period (shares) at Dec. 31, 2018   0 49,276       5,673
Balance at beginning of period at Dec. 31, 2018 1,318,104 $ 0 $ 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 compensa-tion 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   0 49,276       5,995
Balance at end of period at Mar. 31, 2019 1,328,416 $ 0 $ 493 1,225,482 638,574 (107,694) $ (428,439)
Balance at beginning of period (shares) at Dec. 31, 2018   0 49,276       5,673
Balance at beginning of period at Dec. 31, 2018 1,318,104 $ 0 $ 493 1,224,608 606,810 (113,117) $ (400,690)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 110,464            
Balance at end of period (shares) at Sep. 30, 2019   0 49,276       6,393
Balance at end of period at Sep. 30, 2019 1,336,176 $ 0 $ 493 1,229,793 684,865 (113,516) $ (465,459)
Balance at beginning of period (shares) at Mar. 31, 2019   0 49,276       5,995
Balance at beginning of period at Mar. 31, 2019 1,328,416 $ 0 $ 493 1,225,482 638,574 (107,694) $ (428,439)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Exercise of stock options 400     (319)     $ 719
Exercise of stock options (shares)             (10)
Share-based compensa-tion expense 2,315     2,315      
Net income 33,048       33,048    
Cash dividends (10,777)       (10,777)    
Currency translation adjustment 3,762         3,762  
Purchases of treasury stock (shares)             328
Purchases of treasury stock (30,222)           $ (30,222)
Balance at end of period (shares) at Jun. 30, 2019   0 49,276       6,313
Balance at end of period at Jun. 30, 2019 1,326,942 $ 0 $ 493 1,227,478 660,845 (103,932) $ (457,942)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Share-based compensa-tion expense 2,315     2,315      
Net income 34,761       34,761    
Cash dividends (10,741)       (10,741)    
Currency translation adjustment (9,584)         (9,584)  
Purchases of treasury stock (shares)             80
Purchases of treasury stock (7,517)           $ (7,517)
Balance at end of period (shares) at Sep. 30, 2019   0 49,276       6,393
Balance at end of period at Sep. 30, 2019 $ 1,336,176 $ 0 $ 493 $ 1,229,793 $ 684,865 $ (113,516) $ (465,459)