Debt Financing - Consolidated Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt financing	$ 17,811,372	$ 16,696,081
Less: Debt discounts and issuance costs	(194,492)	(177,743)
Debt financing, net of discounts and issuance costs	17,616,880	16,518,338
Total unsecured debt financing
Debt Instrument [Line Items]
Total debt financing	17,661,557	16,395,094
Senior notes
Debt Instrument [Line Items]
Total debt financing	17,490,582	15,583,544
Term financings
Debt Instrument [Line Items]
Total debt financing	170,975	811,550
Total secured debt financing
Debt Instrument [Line Items]
Total debt financing	149,815	300,987
Term financings
Debt Instrument [Line Items]
Total debt financing	129,851	276,032
Export credit financing
Debt Instrument [Line Items]
Total debt financing	$ 19,964	$ 24,955