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Guarantees - Schedule of Long-Term Standby Purchase Commitments (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
LTSPCs      
Guarantor Obligations [Line Items]      
Maximum principal amount   $ 2,881,856 $ 3,002,349
Weighted-average remaining maturity 15 years 2 months 12 days 15 years 3 months 18 days  
Guarantee and commitment obligation      
Guarantor Obligations [Line Items]      
Maximum principal amount   $ 3,300,000 3,500,000
Guarantee and commitment obligation | LTSPCs      
Guarantor Obligations [Line Items]      
Guarantee and commitment obligation   $ 33,909 $ 34,470