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Income (Loss) Per Share - Shares Excluded from EPS (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Common share equivalents      
Diluted income (loss) per share      
Common share equivalents excluded from the diluted weighted average shares outstanding since the Company incurred a net loss and their effect would be antidilutive 947 531 28
Potentially dilutive shares      
Diluted income (loss) per share      
Securities excluded from the diluted calculation as their effect would be antidilutive 923 1,689 2,474
Convertible Notes - 2023, 2025 and 2027      
Diluted income (loss) per share      
Securities excluded from the diluted calculation as their effect would be antidilutive 17,753 8,618 8,618