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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2018 - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Dec. 31, 2017 37,729,000 37,729,000      
Beginning Balance at Dec. 31, 2017 $ 1,191,971 $ 377 $ 266,035 $ 1,045,774 $ (120,215)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 126,887     126,887  
Other comprehensive income:          
Cumulative translation adjustment (17,417)       (17,417)
Issuance of common stock in connection with:          
Exercise of options (in shares)   853,000      
Exercise of options 34,169 $ 9 34,160    
Restricted share grants, less net settled shares of XX (in shares)   307,000      
Restricted share grants, less net settled shares of 51 (2,666) $ 3 (2,669)    
Stock units issued under incentive compensation plan 1,059   1,059    
Purchase and retirement of common stock (in shares)   (533,000)      
Purchase and retirement of common stock (29,220) $ (5) (29,215)    
Cumulative effect due to adoption of new accounting standard 342     342  
Conversion feature of convertible senior notes due 2023, net 34,131   34,131    
Share-based compensation $ 12,219   12,219    
Ending Balance (in shares) at Sep. 30, 2018 38,356,000 38,356,000      
Ending Balance at Sep. 30, 2018 $ 1,351,475 $ 384 $ 315,720 $ 1,173,003 $ (137,632)