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Consolidated Statement of Stockholders' Equity Consolidated Statement of Stockholders' Equity - USD ($)
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Treasury Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (loss)
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
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              
Net income 49,322,000              
Unrealized gains (losses) from foreign currency translation adjustments $ (577,000)         (577,000)    
Repurchases of common stock, shares (208,000)              
Repurchases of common stock, value $ (27,924,000)              
Net income 143,295,000              
Unrealized gains (losses) from foreign currency translation adjustments (1,595,000)              
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  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | Cumulative effect of adoption of ASU 2016-02   $ (26,795,000)           $ (26,795,000)
Stock options exercised, shares     189,000          
Stock options exercised, value 5,999,000   $ 0   5,999,000      
Restricted/Performance stock units vested     7,000          
Share-based Compensation Expense         11,473,000      
Share-based Compensation Expense 11,473,000              
Repurchases of common stock, shares     (208,000) (208,000)        
Repurchases of common stock, value (27,854,000)     $ (27,854,000)        
Net income 44,888,000              
Unrealized gains (losses) from foreign currency translation adjustments 292,000         292,000    
Beginning Balance, shares     53,325,000 15,463,000        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 1,039,874,000   $ 53,000 $ (516,880,000) 564,697,000 (6,484,000) 998,488,000  
Stock options exercised, shares     286,000          
Stock options exercised, value 9,925,000   $ 1,000   9,924,000      
Share-based Compensation Expense         10,855,000      
Share-based Compensation Expense $ 10,855,000              
Repurchases of common stock, shares (1,000)   0 0        
Repurchases of common stock, value $ (70,000)     $ (70,000)        
Net income 49,085,000              
Unrealized gains (losses) from foreign currency translation adjustments (1,310,000)         (1,310,000)    
Beginning Balance, shares     53,611,000 15,463,000        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 1,108,359,000   $ 54,000 $ (516,950,000) 585,476,000 (7,794,000) 1,047,573,000  
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          
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)        
Repurchases of common stock, value (371,000)     $ (371,000)        
Net income 64,456,000              
Unrealized gains (losses) from foreign currency translation adjustments $ (2,463,000)         (2,463,000)    
Stock options exercised, shares 1,316,000              
Repurchases of common stock, shares (4,000)              
Repurchases of common stock, value $ (591,000)              
Net income 169,633,000              
Unrealized gains (losses) from foreign currency translation adjustments 1,504,000              
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  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | Cumulative effect of adoption of ASU 2016-13   $ 439,000           $ 439,000
Stock options exercised, shares     825,000          
Stock options exercised, value 21,213,000   $ 1,000   21,212,000      
Restricted/Performance stock units vested     9,000          
Share-based Compensation Expense         13,188,000      
Share-based Compensation Expense 13,188,000              
Repurchases of common stock, shares     (1,000) (1,000)        
Repurchases of common stock, value (220,000)     $ (220,000)        
Net income 55,772,000              
Unrealized gains (losses) from foreign currency translation adjustments 1,314,000         1,314,000    
Beginning Balance, shares     54,948,000 15,534,000        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 1,344,545,000   $ 55,000 $ (527,171,000) 658,367,000 (7,867,000) 1,221,161,000  
Stock options exercised, shares     107,000          
Stock options exercised, value 6,314,000   $ 0   6,314,000      
Restricted/Performance stock units vested     1,000          
Shares paid for tax withholding, shares     (1,000)          
Shares paid for tax withholding, value (25,000)       (25,000)      
Share-based Compensation Expense         11,912,000      
Share-based Compensation Expense $ 11,912,000              
Repurchases of common stock, shares 0              
Repurchases of common stock, value $ 0              
Net income 49,405,000              
Unrealized gains (losses) from foreign currency translation adjustments 2,653,000         2,653,000    
Beginning Balance, shares     55,055,000 15,534,000        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 1,414,804,000   $ 55,000 $ (527,171,000) $ 676,568,000 $ (5,214,000) $ 1,270,566,000