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Financing Arrangement - Financing arrangement activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Schedule of Joint Ventures [Line Items]        
Interest income (expense) $ (15,502) $ (36,059) $ (92,552) $ (59,749)
Joint Venture | Financing Arrangement        
Schedule of Joint Ventures [Line Items]        
Distributions equal to the partner's share of net (loss) income (398) 1,278 885 5,157
Distributions in excess of the partner's share of net income 398 2,118 3,356 6,071
Adjustment to fair value of financing arrangement obligation (15,502) (39,455) (96,793) (70,977)
Interest income (expense) $ (15,502) $ (36,059) $ (92,552) $ (59,749)