SENIOR NOTES PAYABLE AND OTHER DEBT - Indebtedness of Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	$ 143,721
2020	510,774
2021	1,328,970
2022	1,616,623
2023	1,577,210
Thereafter	6,963,369
Long-term debt and short-term borrowings, gross	12,140,667	$ 12,245,802
Unrestricted cash and cash equivalents	588,343	$ 106,363
Unsecured Revolving Credit Facility and Commercial Paper
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	0
2020	41,484
2021	0
2022	0
2023	0
Thereafter	0
Long-term debt and short-term borrowings, gross	41,484
Principal Amount Due at Maturity
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	131,956
2020	426,284
2021	1,292,027
2022	1,593,067
2023	1,559,708
Thereafter	6,859,843
Long-term debt and short-term borrowings, gross	11,862,885
Scheduled Periodic Amortization
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	11,765
2020	43,006
2021	36,943
2022	23,556
2023	17,502
Thereafter	103,526
Long-term debt and short-term borrowings, gross	$ 236,298

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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