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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 (in shares) at Dec. 31, 2015   41,234      
Beginning Balance at Dec. 31, 2015 $ 1,147,603 $ 412 $ 400,705 $ 855,481 $ (108,995)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
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 (in shares)   820      
Exercise of options 25,242 $ 8 25,234    
Restricted share grants (in shares)   520      
Restricted share grants (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 (in shares) at Dec. 31, 2016   42,037      
Ending Balance at Dec. 31, 2016 1,207,358 $ 420 416,816 941,001 (150,879)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 107,962     107,962  
Other comprehensive income (loss):          
Cumulative translation adjustment 30,664       30,664
Issuance of common stock in connection with:          
Exercise of options (in shares)   123      
Exercise of options 4,133 $ 1 4,132    
Restricted share grants (in shares)   243      
Restricted share grants (4,440) $ 2 (4,442)    
Stock units issued under incentive compensation plan 1,547   1,547    
Purchase and retirement of common stock (in shares)   (4,674)      
Purchase and retirement of common stock (168,094) $ (46) (168,048)    
Cumulative effect due to adoption of new accounting standard (3,189)     (3,189)  
Share-based compensation $ 16,030   16,030    
Ending Balance (in shares) at Dec. 31, 2017 37,729 37,729      
Ending Balance at Dec. 31, 2017 $ 1,191,971 $ 377 266,035 1,045,774 (120,215)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 150,611     150,611  
Other comprehensive income (loss):          
Cumulative translation adjustment $ (27,602)       (27,602)
Issuance of common stock in connection with:          
Exercise of options (in shares) 1,051 1,051      
Exercise of options $ 41,568 $ 11 41,557    
Restricted share grants (in shares)   319      
Restricted share grants (3,094) $ 3 (3,097)    
Stock units issued under incentive compensation plan 1,059   1,059    
Purchase and retirement of common stock (in shares)   (952)      
Purchase and retirement of common stock (55,738) $ (10) (55,728)    
Cumulative effect due to adoption of new accounting standard 342     342  
Conversion feature of convertible senior notes due 2023, net 34,131   34,131    
Share-based compensation $ 15,577   15,577    
Ending Balance (in shares) at Dec. 31, 2018 38,147 38,147      
Ending Balance at Dec. 31, 2018 $ 1,348,825 $ 381 $ 299,534 $ 1,196,727 $ (147,817)