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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common stock
Additional paid-in capital
Retained earnings
Accumulated other comprehensive loss
Beginning balance (in shares) at Dec. 31, 2019   47,654,929      
Beginning balance at Dec. 31, 2019 $ 1,311,192 $ 476 $ 465,652 $ 891,526 $ (46,462)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 31,697     31,697  
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 173        
Other comprehensive income, net of tax expense (8,338)       (8,338)
Exercise of stock options (in shares)   41,530      
Exercise of stock options 952   1,583 (631)  
Issuance of shares under employee stock purchase plan (in shares)   53,694      
Issuance of shares under employee stock purchase plan 3,303   3,303    
Exercise of 3.25% Convertible Note (12)   (12)    
Vested restricted stock 0 $ 3 (3)    
Vested restricted stock (in shares)   (248,001)      
Repurchase and retirement of common stock (in shares)   (1,105,463)      
Repurchase and retirement of common stock (88,469) $ (10) (16,099) (72,360)  
Share based compensation 12,843   12,843    
Ending balance (in shares) at Jun. 30, 2020   46,892,691      
Ending balance at Jun. 30, 2020 1,263,168 $ 469 467,267 850,232 (54,800)
Beginning balance (in shares) at Mar. 31, 2020   47,113,423      
Beginning balance at Mar. 31, 2020 1,241,081 $ 471 462,430 832,648 (54,468)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 38,101     38,101  
Other comprehensive income, net of tax expense (332)       (332)
Issuance of shares under employee stock purchase plan (in shares)   53,694      
Issuance of shares under employee stock purchase plan 3,303   3,303    
Exercise of 3.25% Convertible Note (12)   (12)    
Vested restricted stock $ 0 $ 1 (1)    
Vested restricted stock (in shares)   (70,505)      
Repurchase and retirement of common stock (in shares) (344,931)        
Repurchase and retirement of common stock $ (25,503) $ (3) (4,983) (20,517)  
Share based compensation 6,530   6,530    
Ending balance (in shares) at Jun. 30, 2020   46,892,691      
Ending balance at Jun. 30, 2020 1,263,168 $ 469 467,267 850,232 (54,800)
Beginning balance (in shares) at Dec. 31, 2020   44,346,630      
Beginning balance at Dec. 31, 2020 1,211,018 $ 443 456,274 809,107 (54,806)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 93,640     93,640  
Other comprehensive income, net of tax expense $ (5,168)       (5,168)
Exercise of stock options (in shares) 45,351 45,351      
Exercise of stock options $ 1,331 $ 1 1,330    
Issuance of shares under employee stock purchase plan (in shares)   58,145      
Issuance of shares under employee stock purchase plan 4,232 $ 1 4,231    
Exercise of 3.25% Convertible Note (in shares)   19,033      
Vested restricted stock 0 $ 4 (4)    
Vested restricted stock (in shares)   (434,518)      
Repurchase and retirement of common stock (in shares)   (195,442)      
Repurchase and retirement of common stock (22,934) $ (2) (12,790) (10,142)  
Share based compensation 12,363   12,363    
Other, net 18   18    
Ending balance (in shares) at Jun. 30, 2021   44,708,235      
Ending balance at Jun. 30, 2021 1,294,500 $ 447 461,422 892,605 (59,974)
Beginning balance (in shares) at Mar. 31, 2021   44,489,399      
Beginning balance at Mar. 31, 2021 1,274,911 $ 445 455,625 882,071 (63,230)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 15,717     15,717  
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 0        
Other comprehensive income, net of tax expense 3,256       3,256
Exercise of stock options (in shares)   30,234      
Exercise of stock options 887   887    
Issuance of shares under employee stock purchase plan (in shares)   58,145      
Issuance of shares under employee stock purchase plan 4,232 $ 1 4,231    
Exercise of 3.25% Convertible Note (in shares)   19,033      
Vested restricted stock $ 0 $ 2 (2)    
Vested restricted stock (in shares)   (198,579)      
Repurchase and retirement of common stock (in shares) (87,155)        
Repurchase and retirement of common stock $ (10,754) $ (1) (5,570) (5,183)  
Share based compensation 6,251   6,251    
Ending balance (in shares) at Jun. 30, 2021   44,708,235      
Ending balance at Jun. 30, 2021 $ 1,294,500 $ 447 $ 461,422 $ 892,605 $ (59,974)