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Condensed Consolidated Statement of Stockholders' Equity (USD $)
In Thousands, unless otherwise specified
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive (Loss)
Beginning Balance at Dec. 31, 2013 $ 1,042,259 $ 405 $ 362,322 $ 730,621 $ (51,089)
Beginning Balance (in shares) at Dec. 31, 2013 40,526 40,526      
Net income 57,886     57,886  
Other comprehensive income (loss):          
Cumulative translation adjustment (10,120)       (10,120)
Issuance of common stock in connection with:          
Exercise of options, net of income tax benefit from share-based awards of $323 (in shares)   232      
Exercise of options, net of income tax benefit from share-based awards of $323 5,167 2 5,165    
Restricted share grants, less net settled shares of 159 (in shares)   269      
Restricted share grants, less net settled shares of 159 (5,448) 3 (5,451)    
Stock units issued under incentive compensation plan 1,674   1,674    
Non-employee vesting of stock options 2,951   2,951    
Share-based compensation 18,930   18,930    
Ending Balance at Sep. 30, 2014 $ 1,113,299 $ 410 $ 385,591 $ 788,507 $ (61,209)
Ending Balance (in shares) at Sep. 30, 2014 41,027 41,027