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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)
Beginning balance (in shares) at Dec. 31, 2019     51,277          
Treasury stock (in shares) at Dec. 31, 2019       (9,145)        
Beginning balance at Dec. 31, 2019 $ 845,254 $ (264) $ 51 $ (185,074) $ 780,931 $ 258,792 $ (264) $ (9,446)
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)      
Ending balance (in shares) at Mar. 31, 2020     51,751          
Treasury stock (in shares) at Mar. 31, 2020       (9,145)        
Ending balance at Mar. 31, 2020 $ 878,500   $ 52 $ (185,074) 807,823 269,839   (14,140)
Beginning balance (in shares) at Dec. 31, 2020 42,783   52,677          
Treasury stock (in shares) at Dec. 31, 2020 (9,894)     (9,894)        
Beginning balance at Dec. 31, 2020 $ 967,503   $ 53 $ (238,109) 920,359 290,722   (5,522)
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)      
Ending balance (in shares) at Mar. 31, 2021 43,171   53,065          
Treasury stock (in shares) at Mar. 31, 2021 (9,894)     (9,894)        
Ending balance at Mar. 31, 2021 $ 1,011,011   $ 53 $ (238,109) $ 950,361 $ 304,849   $ (6,143)