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Net Income (Loss) Per Share - Anti-Dilutive Shares (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total anti-dilutive shares (in shares) 29 302
Stock Options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total anti-dilutive shares (in shares) 25 203
Performance Awards    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total anti-dilutive shares (in shares) 3 24
Non-Vested Shares and Deferred Stock Units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total anti-dilutive shares (in shares) 1 75