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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, 2012 $ 1,068,232 $ 408 $ 367,978 $ 741,215 $ (41,369)
Beginning Balance (in shares) at Dec. 31, 2012 40,755,000 40,755,000      
Net income 23,680     23,680  
Other comprehensive income:          
Cumulative translation adjustment (15,509)       (15,509)
Issuance of common stock in connection with:          
Exercise of options, net of income tax expense from share-based awards of $180 (in shares)   98,000      
Exercise of options, net of income tax expense from share-based awards of $180 2,539 1 2,538    
Restricted share grants, less net settled shares of 115 (in shares)   182,000      
Restricted share grants, less net settled shares of 115 (3,944) 1 (3,945)    
Stock units issued under incentive compensation plan 2,825   2,825    
Business combinations (792)   (792)    
Purchase and retirement of common stock (in shares)   (827,000)      
Purchase and retirement of common stock (28,758) (8) (28,750)    
Share-based compensation 10,055   10,055    
Ending Balance at Mar. 31, 2013 $ 1,058,328 $ 402 $ 349,909 $ 764,895 $ (56,878)
Ending Balance (in shares) at Mar. 31, 2013 40,208,000 40,208,000