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Consolidated Statements of Shareholders' Equity - USD ($)
Total
Common Stock
Retained Earnings
Accumulated Other Comprehensive Loss
Shares, Outstanding, Beginning of Period (in shares) at Dec. 31, 2012   17,448,000    
Shareholders' Equity Attributable to Parent, Beginning of Period at Dec. 31, 2012 $ 644,295,000 $ 274,709,000 $ 369,586,000 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income and comprehensive income 54,900,000   54,900,000  
Stock Issued During Period, Shares, New Issues   198,000    
Issuance of common stock 7,506,000 $ 7,506,000    
Tax windfall from stock-based compensation 2,981,000 $ 2,981,000    
Repurchase of common stock (in shares)   (133,000)    
Repurchase of common stock (10,723,000) $ (10,723,000)    
Grant of restricted stock, net of forfeitures (in shares)   435,000    
Grants of restricted stock, net of forfeitures 0      
Stock-based compensation 21,482,000 $ 21,482,000    
Cash & restricted stock dividends (15,652,000)   (15,652,000)  
Foreign currency translation, net of tax 0      
Shares, Outstanding, End of Period (in shares) at Dec. 31, 2013   17,948,000    
Shareholders' Equity Attributable to Parent, End of Period at Dec. 31, 2013 704,789,000 $ 295,955,000 408,834,000 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income and comprehensive income 46,357,000   46,357,000  
Stock Issued During Period, Shares, New Issues   358,000    
Issuance of common stock 23,268,000 $ 23,268,000    
Tax windfall from stock-based compensation $ 7,708,000 $ 7,708,000    
Repurchase of common stock (in shares) (691,000) (851,000)    
Repurchase of common stock $ (76,582,000) $ (76,582,000)    
Grant of restricted stock, net of forfeitures (in shares)   17,000    
Grants of restricted stock, net of forfeitures 0      
Stock-based compensation 11,931,000 $ 11,931,000    
Cash & restricted stock dividends (17,345,000)   (17,345,000)  
Foreign currency translation, net of tax (125,000)     (125,000)
Shares, Outstanding, End of Period (in shares) at Dec. 31, 2014   17,472,000    
Shareholders' Equity Attributable to Parent, End of Period at Dec. 31, 2014 700,001,000 $ 262,280,000 437,846,000 (125,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income and comprehensive income 65,197,000   65,197,000  
Stock Issued During Period, Shares, New Issues   17,000    
Issuance of common stock 3,484,000 $ 3,484,000    
Tax windfall from stock-based compensation 5,553,000 $ 5,553,000    
Repurchase of common stock (in shares)   (1,049,000)    
Repurchase of common stock (151,140,000) $ (151,140,000)    
Grant of restricted stock, net of forfeitures (in shares)   160,000    
Grants of restricted stock, net of forfeitures 0      
Stock-based compensation 13,849,000 $ 13,849,000    
Cash & restricted stock dividends (19,284,000)   (19,284,000)  
Foreign currency translation, net of tax (463,000)     (463,000)
Shares, Outstanding, End of Period (in shares) at Dec. 31, 2015   16,600,000    
Shareholders' Equity Attributable to Parent, End of Period at Dec. 31, 2015 $ 617,197,000 $ 134,026,000 $ 483,759,000 $ (588,000)