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Condensed Consolidated Statement of Stockholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2011 $ 1,106,202 $ 415 $ 383,978 $ 778,201 $ (56,392)
Beginning Balance (in shares) at Dec. 31, 2011 41,484,000 41,484,000      
Net income 48,891     48,891  
Other comprehensive income:          
Cumulative translation adjustment 14,620       14,620
Issuance of common stock in connection with:          
Exercise of options, net of income tax expense from share-based awards of $270 (in shares)   206,000      
Exercise of options, net of income tax expense from share-based awards of $270 5,112 2 5,110    
Restricted share grants, less net settled shares of 129 (in shares)   423,000      
Restricted share grants, less net settled shares of 129 (4,881) 4 (4,885)    
Stock units issued under incentive compensation plan 3,079   3,079    
Business combinations (3,647)   (3,647)    
Reacquisition of equity component of convertible debt (108)   (108)    
Purchase and retirement of common stock (in shares)   (758,000)      
Purchase and retirement of common stock (20,013) (7) (20,006)    
Share-based compensation 24,465   24,465    
Ending Balance at Sep. 30, 2012 $ 1,173,720 $ 414 $ 387,986 $ 827,092 $ (41,772)
Ending Balance (in shares) at Sep. 30, 2012 41,355,000 41,355,000