Senior Notes Payable and Other Debt - Scheduled Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2021	$ 596,017
2022	1,109,463
2023	1,634,194
2024	1,629,168
2025	1,634,766
Thereafter	5,379,463
Total maturities	11,983,071	$ 12,245,802
Unrestricted cash and cash equivalents	413,327	$ 106,363
Unsecured Revolving Credit Facility and Commercial Paper
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2021	39,395
2022	0
2023	0
2024	0
Thereafter	0
Principal Amount Due at Maturity
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2021	511,971
2022	1,070,861
2023	1,609,373
2024	1,610,581
2025	1,619,872
Thereafter	5,285,913
Total maturities	11,708,571
Unsecured Revolving Credit Facility
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2025	0
Total maturities	39,395
Scheduled Periodic Amortization
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2021	44,651
2022	38,602
2023	24,821
2024	18,587
2025	14,894
Thereafter	93,550
Total maturities	$ 235,105

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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