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Debt Financing and Revolving Credit Facilities (Fair Value of Warrant) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Debt Financing and Revolving Credit Facilities [Abstract]          
Warrant liability   $ 12,730   $ 12,730  
Change in fair value $ (3,452) $ 22,128 $ 0 18,676 $ 0
Warrant liability $ 31,406     $ 31,406