SENIOR NOTES PAYABLE AND OTHER DEBT - Indebtedness of Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	$ 159,239
2020	1,047,710
2021	1,297,630
2022	1,609,759
2023	1,562,618
Thereafter	6,951,361
Long-term debt and short-term borrowings, gross	12,628,317	$ 12,245,802
Unrestricted cash and cash equivalents	992,824	$ 106,363
Unsecured Revolving Credit Facility and Commercial Paper
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	0
2020	587,206
2021	0
2022	0
2023	0
Thereafter	0
Long-term debt and short-term borrowings, gross	587,206
Principal Amount Due at Maturity
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	136,671
2020	418,035
2021	1,261,138
2022	1,586,472
2023	1,545,310
Thereafter	6,848,401
Long-term debt and short-term borrowings, gross	11,796,027
Scheduled Periodic Amortization
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	22,568
2020	42,469
2021	36,492
2022	23,287
2023	17,308
Thereafter	102,960
Long-term debt and short-term borrowings, gross	$ 245,084

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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