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Fair Value Measurements (Details) - Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation - Fair Value, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Redeemable Preferred Stock [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance | $ 8,063 | $ 5,247
Change in fair value | 7,375 | (2,082)
Balance | 15,438 | 3,165
3.25% Convertible Senior Notes Due 2023 [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance | 34,134 | 50,753
Conversion of convertible senior notes | (5,631) | 0
Change in fair value | 9,047 | (7,675)
Payment-in-kind interest | 158 | 667
Balance | $ 37,708 | $ 43,745

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