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Earnings (Loss) Per Share (Details 3) - 1.375% Convertible senior notes due 2023 - Convertible senior notes shares in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 $ / shares shares | Jun. 30, 2021 $ / shares shares
Dilutive shares included in calculation of earnings per share |  |
Initial conversion price of notes (in dollars per share) | $ / shares | $ 18.93 | $ 18.93
Dilutive shares included in calculation of earnings per share | 0.5 | 0.5
Potential cumulative common shares attributable to dilutive effect of conversion of convertible notes payable | 9.1 | 9.1

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