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Fair Value Measurements (Details) - Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation - Fair Value, Inputs, Level 3 [Member] - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Redeemable Preferred Stock [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance $ 21,282 $ 8,063
Change in fair value 645 7,375
Balance 21,927 15,438
3.25% Convertible Senior Notes Due 2023 [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance 0 34,134
Conversion of convertible senior notes 0 (5,631)
Change in fair value 0 9,047
Payment-in-kind interest 0 158
Balance $ 0 $ 37,708