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Income (Loss) Per Common Share - Shares Excluded from EPS (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Common share equivalents        
Diluted income (loss) per share        
Securities excluded from the diluted calculation as their effect would be antidilutive   712   671
Potentially dilutive shares        
Diluted income (loss) per share        
Securities excluded from the diluted calculation as their effect would be antidilutive 449 1,194 452 1,132
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 15,354 8,811 15,354