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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance (in shares) at Dec. 31, 2014   51,386,693      
Balance at Dec. 31, 2014 $ 634,408 $ 514 $ 483,902 $ 154,562 $ (4,570)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of common stock options (in shares)   329,502      
Exercise of common stock options 3,472 $ 3 3,469    
Employee stock purchase plan (in shares)   204,401      
Employee stock purchase plan $ 5,293 $ 2 5,291    
Stock Repurchased and Retired During Period, Shares (43,000) (89,174)      
Stock Repurchased and Retired During Period, Value $ (3,819) $ (1) (1,173) (2,645)  
Stock-based compensation expense 23,471   23,471    
Vesting of restricted stock units and restricted stock awards (in shares)   398,850      
Vesting of restricted stock units and restricted stock awards (8,823) $ 4 (8,827)    
Tax deficiency from stock-based compensation $ 6,551 [1]   6,551    
Stock Issued During Period, Shares, Acquisitions 794,700 794,700      
Stock Issued During Period, Value, Acquisitions $ 30,183 $ 8 30,175    
Fair value adjustment of derivatives, net of income tax 122       122
Translation adjustments (3,714)       (3,714)
Net income 97,650     97,650  
Balance (in shares) at Dec. 31, 2015   53,024,972      
Balance at Dec. 31, 2015 784,794 $ 530 542,859 249,567 (8,162)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of common stock options (in shares)   185,484      
Exercise of common stock options 2,251 $ 2 2,249    
Employee stock purchase plan (in shares)   242,303      
Employee stock purchase plan 7,507 $ 2 7,505    
Stock Repurchased and Retired During Period, Shares   (1,133,553)      
Stock Repurchased and Retired During Period, Value (43,091) $ (11) (11,885) (31,195)  
Stock-based compensation expense 26,559   26,559    
Vesting of restricted stock units and restricted stock awards (in shares)   397,182      
Vesting of restricted stock units and restricted stock awards (7,160) $ 4 (7,164)    
Tax deficiency from stock-based compensation 2,739 [1]   2,739    
Fair value adjustment of derivatives, net of income tax 0        
Translation adjustments (1,861)       (1,861)
Net income $ 97,201     97,201  
Balance (in shares) at Dec. 31, 2016 52,716,388 52,716,388      
Balance at Dec. 31, 2016 $ 868,939 $ 527 562,862 315,573 (10,023)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of common stock options (in shares)   36,561      
Exercise of common stock options 351 $ 0 351    
Employee stock purchase plan (in shares)   214,466      
Employee stock purchase plan 7,404 $ 2 7,402    
Stock Repurchased and Retired During Period, Shares   (1,229,249)      
Stock Repurchased and Retired During Period, Value (58,070) $ (12) (13,229) (44,829)  
Stock-based compensation expense 24,509   24,509    
Vesting of restricted stock units and restricted stock awards (in shares)   413,372      
Vesting of restricted stock units and restricted stock awards (15,801) $ 4 (15,805)    
Fair value adjustment of derivatives, net of income tax 0        
Translation adjustments 6,384       6,384
Net income $ 157,675     157,675  
Balance (in shares) at Dec. 31, 2017 52,151,538 52,151,538      
Balance at Dec. 31, 2017 $ 991,391 $ 521 $ 566,090 $ 428,419 $ (3,639)
[1] Effective January 1, 2017, the Company adopted ASU No. 2016-09, Compensation - Stock Compensation (Topic 718). Under this standard, excess tax benefits and deficiencies are recognized as income tax benefit or expense in the consolidated statement of operations and comprehensive income, rather than within paid-in capital, see “Note 2. Accounting Standards Update”.