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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Cumulative effect of a change in accounting principle related to credit losses
Common Stock
Treasury Stock
Additional Paid-In Capital
Accumulated Earnings
Accumulated Earnings
Cumulative effect of a change in accounting principle related to credit losses
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period (in shares) at Dec. 31, 2019     51,277,000          
Balance at beginning of period at Dec. 31, 2019 $ 845,254 $ (264) $ 51 $ (185,074) $ 780,931 $ 258,792 $ (264) $ (9,446)
Balance at beginning of period, Treasury stock (in shares) at Dec. 31, 2019       (9,145,000)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income (loss) 11,311         11,311    
Other comprehensive income (loss) (4,694)             (4,694)
Share-based compensation 10,659       10,659      
Issuance of common stock under employee stock plans (in shares)     474,000          
Issuance of common stock under employee stock plans 17,659   $ 1   17,658      
Tax payments related to restricted stock units (1,425)       (1,425)      
Balance at end of period (in shares) at Mar. 31, 2020     51,751,000          
Balance at end of period at Mar. 31, 2020 878,500   $ 52 $ (185,074) 807,823 269,839   (14,140)
Balance at end of period, Treasury stock (in shares) at Mar. 31, 2020       (9,145,000)        
Balance at beginning of period (in shares) at Dec. 31, 2019     51,277,000          
Balance at beginning of period at Dec. 31, 2019 845,254 $ (264) $ 51 $ (185,074) 780,931 258,792 $ (264) (9,446)
Balance at beginning of period, Treasury stock (in shares) at Dec. 31, 2019       (9,145,000)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income (loss) 15,817              
Other comprehensive income (loss) (733)              
Balance at end of period (in shares) at Sep. 30, 2020     52,168,000          
Balance at end of period at Sep. 30, 2020 918,399   $ 52 $ (238,109) 892,290 274,345   (10,179)
Balance at end of period, Treasury stock (in shares) at Sep. 30, 2020       (9,894,000)        
Balance at beginning of period (in shares) at Mar. 31, 2020     51,751,000          
Balance at beginning of period at Mar. 31, 2020 878,500   $ 52 $ (185,074) 807,823 269,839   (14,140)
Balance at beginning of period, Treasury stock (in shares) at Mar. 31, 2020       (9,145,000)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income (loss) (4,299)         (4,299)    
Other comprehensive income (loss) 451             451
Share-based compensation 11,351       11,351      
Issuance of common stock under employee stock plans (in shares)     151,000          
Issuance of common stock under employee stock plans 3,503       3,503      
Tax payments related to restricted stock units (2,045)       (2,045)      
Balance at end of period (in shares) at Jun. 30, 2020     51,902,000          
Balance at end of period at Jun. 30, 2020 887,461   $ 52 $ (185,074) 820,632 265,540   (13,689)
Balance at end of period, Treasury stock (in shares) at Jun. 30, 2020       (9,145,000)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income (loss) 8,805         8,805    
Other comprehensive income (loss) 3,510             3,510
Share-based compensation 11,024       11,024      
Issuance of common stock under employee stock plans (in shares)     266,000          
Issuance of common stock under employee stock plans 12,064       12,064      
Tax payments related to restricted stock units (631)       (631)      
Stock repurchases (in shares)       (749,000)        
Stock repurchases (53,035)     $ (53,035)        
Equity component of convertible senior note issuance, net of issuance costs 97,830       97,830      
Purchase of convertible note hedge (100,625)       (100,625)      
Sale of warrants related to convertible senior notes 51,290       51,290      
Tax benefits related to convertible senior notes 706       706      
Balance at end of period (in shares) at Sep. 30, 2020     52,168,000          
Balance at end of period at Sep. 30, 2020 $ 918,399   $ 52 $ (238,109) 892,290 274,345   (10,179)
Balance at end of period, Treasury stock (in shares) at Sep. 30, 2020       (9,894,000)        
Balance at beginning of period (in shares) at Dec. 31, 2020 42,783,000   52,677,000          
Balance at beginning of period at Dec. 31, 2020 $ 967,503   $ 53 $ (238,109) 920,359 290,722   (5,522)
Balance at beginning of period, Treasury stock (in shares) at Dec. 31, 2020 (9,894,000)     (9,894,000)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income (loss) $ 14,127         14,127    
Other comprehensive income (loss) (621)             (621)
Share-based compensation 11,772       11,772      
Issuance of common stock under employee stock plans (in shares)     388,000          
Issuance of common stock under employee stock plans 20,826       20,826      
Tax payments related to restricted stock units (2,596)       (2,596)      
Balance at end of period (in shares) at Mar. 31, 2021     53,065,000          
Balance at end of period at Mar. 31, 2021 $ 1,011,011   $ 53 $ (238,109) 950,361 304,849   (6,143)
Balance at end of period, Treasury stock (in shares) at Mar. 31, 2021       (9,894,000)        
Balance at beginning of period (in shares) at Dec. 31, 2020 42,783,000   52,677,000          
Balance at beginning of period at Dec. 31, 2020 $ 967,503   $ 53 $ (238,109) 920,359 290,722   (5,522)
Balance at beginning of period, Treasury stock (in shares) at Dec. 31, 2020 (9,894,000)     (9,894,000)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income (loss) $ 63,868              
Other comprehensive income (loss) $ (2,268)              
Balance at end of period (in shares) at Sep. 30, 2021 43,869,000   53,763,000          
Balance at end of period at Sep. 30, 2021 $ 1,111,336   $ 54 $ (238,109) 1,002,591 354,590   (7,790)
Balance at end of period, Treasury stock (in shares) at Sep. 30, 2021 (9,894,000)     (9,894,000)        
Balance at beginning of period (in shares) at Mar. 31, 2021     53,065,000          
Balance at beginning of period at Mar. 31, 2021 $ 1,011,011   $ 53 $ (238,109) 950,361 304,849   (6,143)
Balance at beginning of period, Treasury stock (in shares) at Mar. 31, 2021       (9,894,000)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income (loss) 20,424         20,424    
Other comprehensive income (loss) 652             652
Share-based compensation 13,039       13,039      
Issuance of common stock under employee stock plans (in shares)     265,000          
Issuance of common stock under employee stock plans 11,517       11,517      
Tax payments related to restricted stock units (4,071)       (4,071)      
Balance at end of period (in shares) at Jun. 30, 2021     53,330,000          
Balance at end of period at Jun. 30, 2021 1,052,572   $ 53 $ (238,109) 970,846 325,273   (5,491)
Balance at end of period, Treasury stock (in shares) at Jun. 30, 2021       (9,894,000)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income (loss) 29,317         29,317    
Other comprehensive income (loss) (2,299)             (2,299)
Share-based compensation 13,666       13,666      
Issuance of common stock under employee stock plans (in shares)     433,000          
Issuance of common stock under employee stock plans 21,574   $ 1   21,573      
Tax payments related to restricted stock units $ (3,494)       (3,494)      
Balance at end of period (in shares) at Sep. 30, 2021 43,869,000   53,763,000          
Balance at end of period at Sep. 30, 2021 $ 1,111,336   $ 54 $ (238,109) $ 1,002,591 $ 354,590   $ (7,790)
Balance at end of period, Treasury stock (in shares) at Sep. 30, 2021 (9,894,000)     (9,894,000)