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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative Effect of a Change in Accounting Principle
Common Stock
Treasury Stock
Additional Paid-In Capital
Accumulated Earnings
Accumulated Earnings
Cumulative Effect of a Change in Accounting Principle
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period (in shares) at Dec. 31, 2019     51,277          
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)        
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          
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          
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)        
Balance at beginning of period (in shares) at Dec. 31, 2019     51,277          
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)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income (loss) 7,012              
Other comprehensive income (loss) (4,243)              
Balance at end of period (in shares) at Jun. 30, 2020     51,902          
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)        
Balance at beginning of period (in shares) at Mar. 31, 2020     51,751          
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)        
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          
Issuance of common stock under employee stock plans 3,503   $ 0   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          
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)        
Balance at beginning of period (in shares) at Dec. 31, 2020 42,783   52,677          
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)     (9,894)        
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          
Issuance of common stock under employee stock plans 20,826   $ 0   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          
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)        
Balance at beginning of period (in shares) at Dec. 31, 2020 42,783   52,677          
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)     (9,894)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income (loss) $ 34,551              
Other comprehensive income (loss) $ 31              
Balance at end of period (in shares) at Jun. 30, 2021 43,436   53,330          
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)     (9,894)        
Balance at beginning of period (in shares) at Mar. 31, 2021     53,065          
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)        
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          
Issuance of common stock under employee stock plans 11,517   $ 0   11,517      
Tax payments related to restricted stock units $ (4,071)       (4,071)      
Balance at end of period (in shares) at Jun. 30, 2021 43,436   53,330          
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)     (9,894)