SENIOR NOTES PAYABLE AND OTHER DEBT - Indebtedness of Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	$ 678,708
2020	616,358
2021	849,570
2022	1,669,610
2023	2,121,873
Thereafter	6,206,627
Long-term debt and short-term borrowings, gross	12,142,746	$ 11,983,071
Unrestricted cash and cash equivalents	143,770	$ 413,327
Unsecured Revolving Credit Facility and Commercial Paper
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	370,000
2020	0
2021	0
2022	0
2023	49,141
Thereafter	0
Long-term debt and short-term borrowings, gross	419,141
Remaining borrowing capacity	275,400
Principal Amount Due at Maturity
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	293,626
2020	564,208
2021	810,886
2022	1,636,695
2023	2,045,971
Thereafter	6,077,692
Long-term debt and short-term borrowings, gross	11,429,078
Scheduled Periodic Amortization
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	15,082
2020	52,150
2021	38,684
2022	32,915
2023	26,761
Thereafter	128,935
Long-term debt and short-term borrowings, gross	$ 294,527

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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