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Consolidated Statement of Stockholders' Equity Consolidated Statement of Stockholders' Equity - USD ($)
Total
Common Stock
Treasury Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (loss)
Retained Earnings
Beginning Balance, shares   53,085,000 15,255,000      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 969,065,000 $ 53,000 $ (489,026,000) $ 533,164,000 $ (6,199,000) $ 931,073,000
Stock options exercised, shares   224,000        
Stock options exercised, value 6,867,000 $ 0   6,867,000    
Restricted/Performance stock units vested   29,000        
Shares paid for tax withholding, shares   (1,000)        
Shares paid for tax withholding, value (123,000)     (123,000)    
Share-based Compensation Expense       7,317,000    
Share-based Compensation Expense $ 7,317,000          
Repurchases of common stock, shares 0          
Repurchases of common stock, value $ 0          
Cumulative Effect on Retained Earnings, Tax | Cumulative effect of adoption of ASU 2016-02 (26,795,000)         (26,795,000)
Net income 49,322,000          
Unrealized losses from foreign currency translation adjustments (577,000)       (577,000)  
Beginning Balance, shares   53,337,000 15,255,000      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 1,005,076,000 $ 53,000 $ (489,026,000) 547,225,000 (6,776,000) 953,600,000
Beginning Balance, shares   53,696,000 15,530,000      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 1,167,874,000 $ 54,000 $ (526,580,000) 600,624,000 (6,718,000) 1,100,494,000
Stock options exercised, shares 384,000 384,000        
Stock options exercised, value $ 13,495,000 $ 0   13,495,000    
Restricted/Performance stock units vested   46,000        
Shares paid for tax withholding, shares   (8,000)        
Shares paid for tax withholding, value (1,424,000)     (1,424,000)    
Share-based Compensation Expense       11,272,000    
Share-based Compensation Expense $ 11,272,000          
Repurchases of common stock, shares (3,000) (3,000) (3,000)      
Repurchases of common stock, value $ (371,000)   $ (371,000)      
Cumulative Effect on Retained Earnings, Tax | Cumulative effect of adoption of ASU 2016-13 439,000         439,000
Net income 64,456,000          
Unrealized losses from foreign currency translation adjustments (2,463,000)       (2,463,000)  
Beginning Balance, shares   54,115,000 15,533,000      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 1,253,278,000 $ 54,000 $ (526,951,000) $ 623,967,000 $ (9,181,000) $ 1,165,389,000