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Condensed Consolidated Statement of Stockholders' Equity - Entity [Domain] - 6 months ended Jun. 30, 2015 - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive (Loss)
Beginning Balance (in shares) at Dec. 31, 2014 41,181 41,181      
Beginning Balance at Dec. 31, 2014 $ 1,102,746 $ 412 $ 393,174 $ 789,428 $ (80,268)
Net income 45,395     45,395  
Other comprehensive income (loss):          
Cumulative translation adjustment (7,184)       (7,184)
Issuance of common stock in connection with:          
Exercise of options, net of income tax impact from share-based awards of $2,599 (in shares)   562      
Exercise of options, net of income tax impact from share-based awards of $2,599 13,723 $ 6 13,717    
Restricted share grants, less net settled shares of 102 (in shares)   64      
Restricted share grants, less net settled shares of 102 (3,803)   (3,803)    
Stock units issued under incentive compensation plan 2,124   2,124    
Share-based compensation $ 10,581   10,581    
Ending Balance (in shares) at Jun. 30, 2015 41,807 41,807      
Ending Balance at Jun. 30, 2015 $ 1,163,582 $ 418 $ 415,793 $ 834,823 $ (87,452)