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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 47,166     47,166  
Other comprehensive income:          
Cumulative translation adjustment (27,223)       (27,223)
Issuance of common stock in connection with:          
Exercise of options, net of income tax expense from share-based awards of $368 (in shares)   213,000      
Exercise of options, net of income tax expense from share-based awards of $368 5,623 2 5,621    
Restricted share grants, less net settled shares of 132 (in shares)   272,000      
Restricted share grants, less net settled shares of 132 (4,530) 2 (4,532)    
Stock units issued under incentive compensation plan 3,005   3,005    
Business combinations (in shares)   81,000      
Business combinations (994) 1 (995)    
Purchase and retirement of common stock (in shares)   (827,000)      
Purchase and retirement of common stock (28,758) (8) (28,750)    
Share-based compensation 17,046   17,046    
Ending Balance at Jun. 30, 2013 $ 1,079,567 $ 405 $ 359,373 $ 788,381 $ (68,592)
Ending Balance (in shares) at Jun. 30, 2013 40,494,000 40,494,000