SENIOR NOTES PAYABLE AND OTHER DEBT - Indebtedness of Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	$ 604,256
2020	611,912
2021	133,683
2022	1,523,059
2023	1,555,826
Thereafter	6,360,442
Total maturities	10,789,178
Long-term debt and short-term borrowings, gross	10,789,178	$ 10,829,702
Unrestricted cash and cash equivalents	82,514	$ 72,277
Revolving credit facility borrowings outstanding, net of cash and cash equivalents	164,600
Unsecured Revolving Credit Facility and Commercial Paper
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	195,000
2020	0
2021	52,135
2022	0
2023	0
Thereafter	0
Total maturities	247,135
Principal Amount Due at Maturity
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	397,176
2020	596,590
2021	67,316
2022	1,510,316
2023	1,546,722
Thereafter	6,280,279
Total maturities	10,398,399
Scheduled Periodic Amortization
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2019	12,080
2020	15,322
2021	14,232
2022	12,743
2023	9,104
Thereafter	80,163
Total maturities	143,644
Senior Notes Included in Thereafter Maturities \| 6.90% Senior Notes due 2037, subject to repurchase at option of holders
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
Total maturities	$ 52,400
Interest rate	6.90%
Senior Notes Included in Thereafter Maturities \| 6.59% Senior Notes due 2038, subject to repurchase at option of holders
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
Total maturities	$ 22,800
Interest rate	6.59%
Revolving Credit Facility
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
Revolving credit facility borrowings outstanding, net of cash and cash equivalents	$ 52,100

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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