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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2013 $ 1,042,259 $ 405 $ 362,322 $ 730,621 $ (51,089)
Beginning Balance (in shares) at Dec. 31, 2013   40,526      
Net income 58,807     58,807  
Other comprehensive income (loss):          
Cumulative translation adjustment (29,179)       (29,179)
Issuance of common stock in connection with:          
Exercise of options, net of income tax benefit from share-based awards of $1,451 in 2014, $2,050 in 2015, $2,051 in 2016 (in shares)   413      
Exercise of options, net of income tax benefit from share-based awards of $1,451 in 2014, $2,050 in 2015, $2,051 in 2016 9,899 $ 4 9,895    
Restricted share grants, less net settled shares of 188 in 2014, 116 in 2015 and 137 in 2016 (in shares)   242      
Restricted share grants, less net settled shares of 188 in 2014, 116 in 2015 and 137 in 2016 (6,508) $ 3 (6,511)    
Stock units issued under incentive compensation plan 1,674   1,674    
Non-employee vesting of stock options 2,951   2,951    
Share-based compensation 22,843   22,843    
Ending Balance at Dec. 31, 2014 1,102,746 $ 412 393,174 789,428 (80,268)
Ending Balance (in shares) at Dec. 31, 2014   41,181      
Net income 66,053     66,053  
Other comprehensive income (loss):          
Cumulative translation adjustment (28,727)       (28,727)
Issuance of common stock in connection with:          
Exercise of options, net of income tax benefit from share-based awards of $1,451 in 2014, $2,050 in 2015, $2,051 in 2016 (in shares)   713      
Exercise of options, net of income tax benefit from share-based awards of $1,451 in 2014, $2,050 in 2015, $2,051 in 2016 19,026 $ 7 19,019    
Restricted share grants, less net settled shares of 188 in 2014, 116 in 2015 and 137 in 2016 (in shares)   105      
Restricted share grants, less net settled shares of 188 in 2014, 116 in 2015 and 137 in 2016 (4,371) $ 1 (4,372)    
Stock units issued under incentive compensation plan 2,124   2,124    
Purchase and retirement of common stock (in shares)   (765)      
Purchase and retirement of common stock (26,532) $ (8) (26,524)    
Share-based compensation 17,284   17,284    
Ending Balance at Dec. 31, 2015 $ 1,147,603 $ 412 400,705 855,481 (108,995)
Ending Balance (in shares) at Dec. 31, 2015 41,234 41,234      
Net income $ 85,520     85,520  
Other comprehensive income (loss):          
Cumulative translation adjustment $ (41,884)       (41,884)
Issuance of common stock in connection with:          
Exercise of options, net of income tax benefit from share-based awards of $1,451 in 2014, $2,050 in 2015, $2,051 in 2016 (in shares) 816 820      
Exercise of options, net of income tax benefit from share-based awards of $1,451 in 2014, $2,050 in 2015, $2,051 in 2016 $ 25,242 $ 8 25,234    
Restricted share grants, less net settled shares of 188 in 2014, 116 in 2015 and 137 in 2016 (in shares)   520      
Restricted share grants, less net settled shares of 188 in 2014, 116 in 2015 and 137 in 2016 (5,536) $ 5 (5,541)    
Stock units issued under incentive compensation plan 1,842   1,842    
Purchase and retirement of common stock (in shares)   (537)      
Purchase and retirement of common stock (21,489) $ (5) (21,484)    
Share-based compensation 16,060   16,060    
Ending Balance at Dec. 31, 2016 $ 1,207,358 $ 420 $ 416,816 $ 941,001 $ (150,879)
Ending Balance (in shares) at Dec. 31, 2016 42,037 42,037