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Consolidated Statements Of Equity - USD ($)
$ in Thousands
Total
Common Stock
Treasury Stock
Additional Paid In Capital
Retained Earnings
Accumulated Other Comprehensive (Loss) Income
Non- controlling Interest
Beginning balance (in shares) at Dec. 31, 2015   52,883,902 0        
Beginning balance at Dec. 31, 2015 $ 1,260,665 $ 5 $ 0 $ 607,649 $ 833,356 $ (181,482) $ 1,137
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Exercise of stock options/RSU/PSU (in shares)   430,930          
Exercise of stock options and vesting of RSU's and PSU's 18,889     18,889      
Common stock issued under employee stock purchase plan (in shares)   39,747          
Common stock issued under employee stock purchase plan 2,702     2,702      
Purchased common stock (in shares)   (102,774) (102,774)        
Purchased common stock (8,946)   $ (8,946)        
Stock-based compensation 21,734     21,734      
Net income 260,716       260,752   (36)
Foreign currency translation adjustments 3,163         3,148 15
Unrealized gain on derivatives, net of tax 49         49  
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax (298)         (298)  
Purchase of noncontrolling interest (950)           (950)
Ending balance (in shares) at Dec. 31, 2016   53,251,805 102,774        
Ending balance at Dec. 31, 2016 1,557,724 $ 5 $ (8,946) 650,974 1,094,108 (178,583) 166
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Exercise of stock options/RSU/PSU (in shares)   617,662          
Exercise of stock options and vesting of RSU's and PSU's 25,062     25,062      
Common stock issued under employee stock purchase plan (in shares)   35,467          
Common stock issued under employee stock purchase plan 3,592     3,592      
Purchased common stock (in shares)   (275,495) (275,495)        
Purchased common stock (39,987)   $ (39,987)        
Stock-based compensation 23,021     23,021      
Net income 347,588       347,614   (26)
Foreign currency translation adjustments 101,056         100,999 57
Unrealized gain on derivatives, net of tax (58)         (58)  
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax (240)         (240)  
Realized loss on available-for-sale investments, net of tax 538         538  
Purchase of noncontrolling interest (197)           (197)
Ending balance (in shares) at Dec. 31, 2017   53,629,439 378,269        
Ending balance at Dec. 31, 2017 2,022,322 $ 5 $ (48,933) 704,727 1,443,867 (77,344) 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Exercise of stock options/RSU/PSU (in shares)   351,795          
Exercise of stock options and vesting of RSU's and PSU's 9,895     9,895      
Common stock issued under employee stock purchase plan (in shares)   12,198          
Common stock issued under employee stock purchase plan 2,288     2,288      
Purchased common stock (in shares)   (1,051,825) (1,051,825)        
Purchased common stock (176,065)   $ (176,065)        
Stock-based compensation 28,027     28,027      
Net income 404,169       404,027   142
Foreign currency translation adjustments (85,590)         (85,577) (13)
Unrealized gain on derivatives, net of tax 15         15  
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax 0            
Noncontrolling interest of acquired company 558           558
Ending balance (in shares) at Dec. 31, 2018   52,941,607 1,430,094        
Ending balance at Dec. 31, 2018 $ 2,206,235 $ 5 $ (224,998) $ 744,937 $ 1,848,500 $ (162,896) $ 687