Senior Notes Payable and Other Debt - Scheduled Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2022	$ 721,853
2023	734,832
2024	1,684,136
2025	2,130,809
2026	1,055,454
Thereafter	5,766,054
Total maturities	12,093,138	$ 11,983,071
Unrestricted cash and cash equivalents	149,725	$ 413,327
Unsecured Revolving Credit Facility and Commercial Paper
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2022	280,000
2023	0
2024	0
2025	56,448
Thereafter	0
Line of credit facility, remaining borrowing capacity	186,700
Principal Amount Due at Maturity
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2022	389,966
2023	696,075
2024	1,651,162
2025	2,047,551
2026	1,035,585
Thereafter	5,656,800
Total maturities	11,477,139
Unsecured Revolving Credit Facility
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2026	0
Total maturities	336,448
Scheduled Periodic Amortization
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2022	51,887
2023	38,757
2024	32,974
2025	26,810
2026	19,869
Thereafter	109,254
Total maturities	$ 279,551

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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