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Consolidated Statements 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, 2009 $ 1,102,698 $ 470 $ 541,453 $ 608,314 $ (47,539)
Beginning Balance (in shares) at Dec. 31, 2009   46,985,000      
Net income (loss) 65,984     65,984  
Other comprehensive income (loss):          
Cumulative translation adjustment (5,951)       (5,951)
Issuance of common stock in connection with:          
Exercise of options, net of income tax expense from share-based awards of $994 in 2012, $846 in 2011 and $227 in 2010 (in shares)   408,000      
Exercise of options, net of income tax expense from share-based awards of $994 in 2012, $846 in 2011 and $227 in 2010 10,516 4 10,512    
Restricted share grants, less net settled shares of 178 in 2012, 119 in 2011 and 106 in 2010 (in shares)   510,000      
Restricted share grants, less net settled shares of 178 in 2012, 119 in 2011 and 106 in 2010 (4,094) 5 (4,099)    
Stock units issued under incentive compensation plan 6,531   6,531    
Business combinations (2,931)   (2,931)    
Purchase and retirement of common stock (in shares) (1,178,089) (1,759,000)      
Purchase and retirement of common stock (40,634) (18) (40,616)    
Share-based compensation 35,487   35,487    
Ending Balance at Dec. 31, 2010 1,167,606 461 546,337 674,298 (53,490)
Ending Balance (in shares) at Dec. 31, 2010   46,144,000      
Net income (loss) 103,903     103,903  
Other comprehensive income (loss):          
Cumulative translation adjustment (2,902)       (2,902)
Issuance of common stock in connection with:          
Exercise of options, net of income tax expense from share-based awards of $994 in 2012, $846 in 2011 and $227 in 2010 (in shares)   637,000      
Exercise of options, net of income tax expense from share-based awards of $994 in 2012, $846 in 2011 and $227 in 2010 16,423 7 16,416    
Restricted share grants, less net settled shares of 178 in 2012, 119 in 2011 and 106 in 2010 (in shares)   436,000      
Restricted share grants, less net settled shares of 178 in 2012, 119 in 2011 and 106 in 2010 (4,466) 4 (4,470)    
Stock units issued under incentive compensation plan 4,241   4,241    
Business combinations (5,455)   (5,455)    
Purchase and retirement of common stock (in shares) (5,733,205) (5,733,000)      
Purchase and retirement of common stock (209,400) (57) (209,343)    
Share-based compensation 36,252   36,252    
Ending Balance at Dec. 31, 2011 1,106,202 415 383,978 778,201 (56,392)
Ending Balance (in shares) at Dec. 31, 2011 41,484,000 41,484,000      
Net income (loss) (36,986)     (36,986)  
Other comprehensive income (loss):          
Cumulative translation adjustment 15,023       15,023
Issuance of common stock in connection with:          
Exercise of options, net of income tax expense from share-based awards of $994 in 2012, $846 in 2011 and $227 in 2010 (in shares) 329,000 328,000      
Exercise of options, net of income tax expense from share-based awards of $994 in 2012, $846 in 2011 and $227 in 2010 7,043 4 7,039    
Restricted share grants, less net settled shares of 178 in 2012, 119 in 2011 and 106 in 2010 (in shares)   443,000      
Restricted share grants, less net settled shares of 178 in 2012, 119 in 2011 and 106 in 2010 (6,385) 4 (6,389)    
Stock units issued under incentive compensation plan 3,079   3,079    
Business combinations 1,035 2 1,033    
Business combinations (in shares)   181,000      
Reacquisition of equity component of convertible debt (108)   (108)    
Purchase and retirement of common stock (in shares)   (1,681,000)      
Purchase and retirement of common stock (50,032) (17) (50,015)    
Share-based compensation 29,361   29,361    
Ending Balance at Dec. 31, 2012 $ 1,068,232 $ 408 $ 367,978 $ 741,215 $ (41,369)
Ending Balance (in shares) at Dec. 31, 2012 40,755,000 40,755,000