Senior Notes and Other Debt (Scheduled Maturities) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2020	$ 884,394
2021	520,787
2022	1,302,824
2023	1,621,513
2024	1,585,025
Thereafter	6,331,259
Total maturities	12,245,802
Line of Credit Facility and Commercial Paper Program amount outstanding	581,900
Unrestricted cash and cash equivalents	$ 106,363	$ 72,277
Minimum percentage of total unencumbered assets as a percentage of unsecured debt required to be maintained (as a percent)	150.00%
Unsecured Revolving Credit Facility and Commercial Paper
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2020	$ 567,450
2021	120,787
2022	0
2023	0
2024	0
Thereafter	0
Total maturities	688,237
Principal Amount Due at Maturity
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2020	276,653
2021	361,046
2022	1,269,661
2023	1,602,104
2024	1,571,967
Thereafter	6,243,430
Total maturities	11,324,861
Scheduled Periodic Amortization
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2020	40,291
2021	38,954
2022	33,163
2023	19,409
2024	13,058
Thereafter	87,829
Total maturities	$ 232,704

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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