Accounting Policies and Related Matters - Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Accounts payable	$ 101,592	$ 58,646
Accrued interest	112,202	104,548
Other accrued expenses	41,471	71,860
Unearned revenues	115,411	183,011
Taxes payable	99,916	97,094
Other liabilities	571,002	494,323
Total	$ 1,041,594	$ 1,009,482