SENIOR NOTES PAYABLE AND OTHER DEBT - Indebtedness of Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	$ 754,208
2020	1,132,405
2021	1,239,938
2022	1,644,970
2023	1,686,445
Thereafter	5,392,198
Long-term debt and short-term borrowings, gross	11,850,164	$ 11,983,071
Unrestricted cash and cash equivalents	169,661	$ 413,327
Unsecured Revolving Credit Facility and Commercial Paper
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	215,000
2020	0
2021	0
2022	0
2023	44,799
Thereafter	0
Long-term debt and short-term borrowings, gross	259,799
Long-term debt and short-term borrowings, net of unrestricted cash and cash equivalents	90,100
Principal Amount Due at Maturity
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	504,019
2020	1,092,983
2021	1,214,424
2022	1,625,735
2023	1,626,128
Thereafter	5,297,089
Long-term debt and short-term borrowings, gross	11,360,378
Scheduled Periodic Amortization
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	35,189
2020	39,422
2021	25,514
2022	19,235
2023	15,518
Thereafter	95,109
Long-term debt and short-term borrowings, gross	$ 229,987

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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