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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, 2010 $ 1,167,606 $ 461 $ 546,337 $ 674,298 $ (53,490)
Beginning 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 $846 in 2011, $994 in 2012 and $1,051 in 2013 (in shares)   637,000      
Exercise of options, net of income tax expense from share-based awards of $846 in 2011, $994 in 2012 and $1,051 in 2013 16,423 7 16,416    
Restricted share grants, less net settled shares of 119 in 2011, 178 in 2012 and 178 in 2013 (in shares)   436,000      
Restricted share grants, less net settled shares of 119 in 2011, 178 in 2012 and 178 in 2013 (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      
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 $846 in 2011, $994 in 2012 and $1,051 in 2013 (in shares)   328,000      
Exercise of options, net of income tax expense from share-based awards of $846 in 2011, $994 in 2012 and $1,051 in 2013 7,043 4 7,039    
Restricted share grants, less net settled shares of 119 in 2011, 178 in 2012 and 178 in 2013 (in shares)   443,000      
Restricted share grants, less net settled shares of 119 in 2011, 178 in 2012 and 178 in 2013 (6,385) 4 (6,389)    
Stock units issued under incentive compensation plan 3,079   3,079    
Business combinations (in shares)   181,000      
Business combinations 1,035 2 1,033    
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      
Net income (loss) (10,594)     (10,594)  
Other comprehensive income (loss):          
Cumulative translation adjustment (9,720)       (9,720)
Issuance of common stock in connection with:          
Exercise of options, net of income tax expense from share-based awards of $846 in 2011, $994 in 2012 and $1,051 in 2013 (in shares) 1,278,000 1,278,000      
Exercise of options, net of income tax expense from share-based awards of $846 in 2011, $994 in 2012 and $1,051 in 2013 34,979 13 34,966    
Restricted share grants, less net settled shares of 119 in 2011, 178 in 2012 and 178 in 2013 (in shares)   369,000      
Restricted share grants, less net settled shares of 119 in 2011, 178 in 2012 and 178 in 2013 (6,337) 3 (6,340)    
Stock units issued under incentive compensation plan 3,005   3,005    
Business combinations (in shares)   81,000      
Business combinations (1,305) 1 (1,306)    
Purchase and retirement of common stock (in shares)   (1,957,000)      
Purchase and retirement of common stock (71,130) (20) (71,110)    
Share-based compensation 35,129   35,129    
Ending Balance at Dec. 31, 2013 $ 1,042,259 $ 405 $ 362,322 $ 730,621 $ (51,089)
Ending Balance (in shares) at Dec. 31, 2013 40,526,000 40,526,000