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Income (Loss) Per Share - Shares Excluded from EPS (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Common share equivalents    
Diluted income (loss) per share    
Securities excluded from the diluted calculation as their effect would be antidilutive   627
Potentially dilutive shares    
Diluted income (loss) per share    
Securities excluded from the diluted calculation as their effect would be antidilutive 878 1,485
Convertible Notes - 2023, 2025 and 2027    
Diluted income (loss) per share    
Securities excluded from the diluted calculation as their effect would be antidilutive 8,811 8,618