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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-in Capital
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Dec. 31, 2017     37,729        
Beginning Balance at Dec. 31, 2017 $ 1,191,971 $ 342 $ 377 $ 266,035 $ 1,045,774 $ 342 $ (120,215)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 150,611       150,611    
Other comprehensive loss:              
Cumulative translation adjustment (27,602)           (27,602)
Issuance of common stock in connection with:              
Exercise of options (in shares)     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)      
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        
Ending Balance at Dec. 31, 2018 1,348,825   $ 381 299,534 1,196,727   (147,817)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 216,726       216,726    
Other comprehensive loss:              
Cumulative translation adjustment 6,970           6,970
Issuance of common stock in connection with:              
Exercise of options (in shares)     256        
Exercise of options 9,688   $ 3 9,685      
Restricted share grants (in shares)     245        
Restricted share grants (6,517)   $ 3 (6,520)      
Stock units issued under incentive compensation plan 1,413     1,413      
Purchase and retirement of common stock (in shares)     (1,258)        
Purchase and retirement of common stock (105,941)   $ (13) (105,928)      
Share-based compensation $ 17,978     17,978      
Ending Balance (in shares) at Dec. 31, 2019 37,390   37,390        
Ending Balance at Dec. 31, 2019 $ 1,489,142   $ 374 216,162 1,413,453   (140,847)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 210,682       210,682    
Other comprehensive loss:              
Cumulative translation adjustment $ 34,412           34,412
Issuance of common stock in connection with:              
Exercise of options (in shares) 140   140        
Exercise of options $ 4,934   $ 1 4,933      
Restricted share grants (in shares)     220        
Restricted share grants (10,756)   $ 3 (10,759)      
Stock units issued under incentive compensation plan 2,314     2,314      
Purchase and retirement of common stock (in shares)     (3,269)        
Purchase and retirement of common stock (353,451)   $ (33) (235,554)      
Share-based compensation $ 22,904     22,904      
Ending Balance (in shares) at Dec. 31, 2020 34,481   34,481        
Ending Balance at Dec. 31, 2020 $ 1,400,181   $ 345 $ 0 $ 1,506,271   $ (106,435)