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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, 2011 $ 1,106,202 $ 415 $ 383,978 $ 778,201 $ (56,392)
Beginning Balance (in shares) at Dec. 31, 2011 41,484 41,484      
Net income 26,178     26,178  
Other comprehensive income:          
Cumulative translation adjustment 1,889       1,889
Issuance of common stock in connection with:          
Exercise of options, net of income tax expense from share-based awards of $218 (in shares)   137      
Exercise of options, net of income tax expense from share-based awards of $218 3,497 1 3,496    
Restricted share grants, less net settled shares of 117 (in shares)   418      
Restricted share grants, less net settled shares of 117 (4,572) 4 (4,576)    
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)    
Share-based compensation 17,805   17,805    
Ending Balance at Jun. 30, 2012 $ 1,150,323 $ 420 $ 400,027 $ 804,379 $ (54,503)
Ending Balance (in shares) at Jun. 30, 2012 42,039 42,039