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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2017 $ 764,597 $ 702 $ 610,345 $ 550,866 $ (319,960) $ (77,356)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) (18,769)     (18,769)    
Other comprehensive loss (11,110)         (11,110)
Stock-based compensation 20,642   20,642      
Shares issued and forfeited, net, under stock plans including income tax benefits 20,712   1,560   19,152  
Repurchase of common stock (54,527)       (54,527)  
Repurchase of restricted share awards and restricted share units for tax withholdings (2,588)       (2,588)  
Cumulative effect of accounting change, ASC 606 243,981     243,981    
Ending balance at Sep. 30, 2018 962,938 702 632,547 776,078 (357,923) (88,466)
Beginning balance at Jun. 30, 2018 940,715 702 624,851 760,845 (361,079) (84,604)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 15,233     15,233    
Other comprehensive loss (3,862)         (3,862)
Stock-based compensation 6,575   6,575      
Shares issued and forfeited, net, under stock plans including income tax benefits 4,277   1,121   3,156  
Ending balance at Sep. 30, 2018 962,938 702 632,547 776,078 (357,923) (88,466)
Beginning balance at Dec. 31, 2018 1,048,231 702 632,235 863,768 (355,857) (92,617)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 11,576     11,576    
Other comprehensive loss (2,019)         (2,019)
Stock-based compensation 30,328   30,328      
Shares issued and forfeited, net, under stock plans including income tax benefits 9,260   (1,910)   11,170  
Repurchase of common stock (35,617)       (35,617)  
Repurchase of restricted share awards and restricted share units for tax withholdings (2,822)       (2,822)  
Ending balance at Sep. 30, 2019 1,058,937 702 660,653 875,344 (383,126) (94,636)
Beginning balance at Jun. 30, 2019 1,052,577 702 650,797 843,530 (349,426) (93,026)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 31,814     31,814    
Other comprehensive loss (1,610)         (1,610)
Stock-based compensation 9,371   9,371      
Shares issued and forfeited, net, under stock plans including income tax benefits 1,784   485   1,299  
Repurchase of common stock (34,986)       (34,986)  
Repurchase of restricted share awards and restricted share units for tax withholdings (13)       (13)  
Ending balance at Sep. 30, 2019 $ 1,058,937 $ 702 $ 660,653 $ 875,344 $ (383,126) $ (94,636)