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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) 92,580     92,580  
Other comprehensive income, net of tax expense (11,532)       (11,532)
Vested restricted stock (in shares)   267,894      
Vested restricted stock 0 $ 3 (3)    
Repurchase and retirement of common stock (in shares)   (3,250,706)      
Repurchase and retirement of common stock (238,905) $ (31) (37,541) (201,333)  
Share based compensation 18,643   18,643    
Other, net 116   116    
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    
Redemption of 3.25% Convertible Note including tax impact (12)   (12)    
Ending balance (in shares) at Sep. 30, 2020   44,767,341      
Ending balance at Sep. 30, 2020 1,176,337 $ 448 451,741 782,142 (57,994)
Beginning balance (in shares) at Jun. 30, 2020   46,892,691      
Beginning balance at Jun. 30, 2020 1,263,168 $ 469 467,267 850,232 (54,800)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 60,883     60,883  
Other comprehensive income, net of tax expense (3,194)       (3,194)
Vested restricted stock (in shares)   19,893      
Repurchase and retirement of common stock (in shares)   (2,145,243)      
Repurchase and retirement of common stock (150,436) $ (21) (21,442) (128,973)  
Share based compensation 5,800   5,800    
Other, net 116   116    
Ending balance (in shares) at Sep. 30, 2020   44,767,341      
Ending balance at Sep. 30, 2020 1,176,337 $ 448 451,741 782,142 (57,994)
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) 136,209     136,209  
Other comprehensive income, net of tax expense (16,383)       (16,383)
Vested restricted stock (in shares)   546,684      
Vested restricted stock 0 $ 5 (5)    
Repurchase and retirement of common stock (in shares)   (245,083)      
Repurchase and retirement of common stock (29,855) $ (3) (15,825) (14,027)  
Share based compensation 19,119   19,119    
Other, net $ (2,183)   (2,371) 188  
Exercise of stock options (in shares) 68,601 68,601      
Exercise of stock options $ 2,880 $ 1 2,879    
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    
Redemption of 3.25% Convertible Note including tax impact   3,050,850      
Redemption of 3.25% Convertible Note including tax impact 44,222 $ 31 44,191    
Ending balance (in shares) at Sep. 30, 2021   47,825,827      
Ending balance at Sep. 30, 2021 1,369,259 $ 478 508,493 931,477 (71,189)
Beginning balance (in shares) at Jun. 30, 2021   44,708,235      
Beginning balance at Jun. 30, 2021 1,294,500 $ 447 461,422 892,605 (59,974)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 42,569     42,569  
Other comprehensive income, net of tax expense (11,215)       (11,215)
Vested restricted stock (in shares)   112,166      
Vested restricted stock 0 $ 1 (1)    
Repurchase and retirement of common stock (in shares)   (49,641)      
Repurchase and retirement of common stock (6,921) $ (1) (3,035) (3,885)  
Share based compensation 6,755   6,755    
Other, net (2,201)   (2,389) 188  
Exercise of stock options (in shares)   23,250      
Exercise of stock options 1,549   1,549    
Redemption of 3.25% Convertible Note including tax impact   3,031,817      
Redemption of 3.25% Convertible Note including tax impact 44,223 $ 31 44,192    
Ending balance (in shares) at Sep. 30, 2021   47,825,827      
Ending balance at Sep. 30, 2021 $ 1,369,259 $ 478 $ 508,493 $ 931,477 $ (71,189)