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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock Issued
Additional Paid–In Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Treasury Stock
Non–Controlling Interest
Beginning Balance (in shares) at Dec. 31, 2017   47,352          
Beginning balance at Dec. 31, 2017 $ 1,630,100 $ 473 $ 569,319 $ 1,312,660 $ (89,230) $ (172,342) $ 9,220
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock issued (in shares)   148          
Stock issued 576 $ 2 574        
Share repurchases for tax withholdings (11,810)   (11,810)        
Stock-based compensation expense 8,955   8,955        
Foreign currency translation 1,693       1,403   290
Net income 52,671     51,970     701
Ending Balance (in shares) at Mar. 31, 2018   47,500          
Ending balance at Mar. 31, 2018 1,682,823 $ 475 567,038 1,365,268 (87,827) (172,342) 10,211
Beginning Balance (in shares) at Dec. 31, 2017   47,352          
Beginning balance at Dec. 31, 2017 1,630,100 $ 473 569,319 1,312,660 (89,230) (172,342) 9,220
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 91,237            
Ending Balance (in shares) at Jun. 30, 2018   47,514          
Ending balance at Jun. 30, 2018 1,715,995 $ 475 574,818 1,403,693 (100,518) (172,342) 9,869
Beginning Balance (in shares) at Mar. 31, 2018   47,500          
Beginning balance at Mar. 31, 2018 1,682,823 $ 475 567,038 1,365,268 (87,827) (172,342) 10,211
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock issued (in shares)   14          
Stock issued 875   875        
Stock-based compensation expense 6,905   6,905        
Foreign currency translation (13,175)       (12,691)   (484)
Net income 38,566           142
Ending Balance (in shares) at Jun. 30, 2018   47,514          
Ending balance at Jun. 30, 2018 1,715,995 $ 475 574,818 1,403,693 (100,518) (172,342) 9,869
Beginning Balance (in shares) at Dec. 31, 2018   47,557          
Beginning balance at Dec. 31, 2018 1,795,924 $ 475 593,262 1,481,593 (117,291) (172,342) 10,227
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock issued (in shares)   117          
Stock issued 405 $ 1 404        
Share repurchases for tax withholdings (9,723)   (9,723)        
Stock-based compensation expense 9,703   9,703        
Adjustments of redeemable non-controlling interest 0   41,400 (41,400)      
Foreign currency translation 4,371       4,409   (38)
Net income 16,208     16,134     74
Ending Balance (in shares) at Mar. 31, 2019   47,674          
Ending balance at Mar. 31, 2019 1,816,888 $ 476 635,046 1,456,327 (112,882) (172,342) 10,263
Beginning Balance (in shares) at Dec. 31, 2018   47,557          
Beginning balance at Dec. 31, 2018 1,795,924 $ 475 593,262 1,481,593 (117,291) (172,342) 10,227
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Adjustments of redeemable non-controlling interest (41,400)            
Net income 48,059            
Ending Balance (in shares) at Jun. 30, 2019   47,701          
Ending balance at Jun. 30, 2019 1,843,563 $ 477 651,944 1,470,134 (117,248) (172,342) 10,598
Beginning Balance (in shares) at Mar. 31, 2019   47,674          
Beginning balance at Mar. 31, 2019 1,816,888 $ 476 635,046 1,456,327 (112,882) (172,342) 10,263
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock issued (in shares)   27          
Stock issued 1,876 $ 1 1,875        
Share repurchases for tax withholdings (135)   (135)        
Stock-based compensation expense 15,158   15,158        
Adjustments of redeemable non-controlling interest (17,720)     (17,720)      
Foreign currency translation (4,355)       (4,366)   11
Net income 31,851     31,527     324
Ending Balance (in shares) at Jun. 30, 2019   47,701          
Ending balance at Jun. 30, 2019 $ 1,843,563 $ 477 $ 651,944 $ 1,470,134 $ (117,248) $ (172,342) $ 10,598