SENIOR NOTES PAYABLE AND OTHER DEBT - Indebtedness of Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	$ 617,006
2020	1,019,983
2021	1,247,341
2022	1,666,042
2023	1,696,617
Thereafter	5,603,567
Long-term debt and short-term borrowings, gross	11,850,556	$ 11,983,071
Unrestricted cash and cash equivalents	233,837	$ 413,327
Unsecured Revolving Credit Facility and Commercial Paper
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	170,000
2020	0
2021	0
2022	0
2023	46,324
Thereafter	0
Long-term debt and short-term borrowings, gross	216,324
Principal Amount Due at Maturity
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	422,380
2020	978,030
2021	1,219,370
2022	1,644,318
2023	1,632,255
Thereafter	5,486,317
Long-term debt and short-term borrowings, gross	11,382,670
Scheduled Periodic Amortization
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	24,626
2020	41,953
2021	27,971
2022	21,724
2023	18,038
Thereafter	117,250
Long-term debt and short-term borrowings, gross	$ 251,562

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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