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Indebtedness - Schedule of Secured and Other Debt (Details) $ in Thousands | Dec. 31, 2019 USD ($) property | Dec. 31, 2018 USD ($) | Mar. 31, 2017
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal Balance | $ 694,739 | $ 744,186 |
Net Book Value of Collateral | 5,890,785 | 6,341,908 |
Unamortized net premiums | (506) |  |
Secured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Principal Balance | $ 698,235 | 744,580 |
Number of Properties as Collateral | property | 11 |  |
Net Book Value of Collateral | $ 859,004 | 942,614 |
Unamortized net premiums | 506 |  |
Deb issuance costs | 25 | 394 |
Secured Debt | Mortgage notes 3.79% maturing in July 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Principal Balance | $ 0 | 42,618 |
Interest rate (as a percent) | 3.79% |  |
Number of Properties as Collateral | property | 0 |  |
Net Book Value of Collateral | $ 0 | 61,199 |
Secured Debt | Mortgage notes 7.49% maturing in January 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Principal Balance | $ 1,426 | 2,037 |
Interest rate (as a percent) | 7.49% |  |
Number of Properties as Collateral | property | 1 |  |
Net Book Value of Collateral | $ 11,469 | 14,602 |
Secured Debt | Mortgage notes 6.28% maturing July 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Principal Balance | $ 12,513 | 13,146 |
Interest rate (as a percent) | 6.28% |  |
Number of Properties as Collateral | property | 1 |  |
Net Book Value of Collateral | $ 23,662 | 24,064 |
Secured Debt | Mortgage notes 4.85% maturing October 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Principal Balance | $ 10,958 | 11,180 |
Interest rate (as a percent) | 4.85% |  |
Number of Properties as Collateral | property | 1 |  |
Net Book Value of Collateral | $ 20,139 | 20,602 |
Secured Debt | Mortgage notes 5.75% maturing October 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Principal Balance | $ 16,131 | 16,441 |
Interest rate (as a percent) | 5.75% |  |
Number of Properties as Collateral | property | 2 |  |
Net Book Value of Collateral | $ 19,751 | 20,342 |
Secured Debt | Mortgage notes 6.64% maturing June 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Principal Balance | $ 16,056 | 16,442 |
Interest rate (as a percent) | 6.64% |  |
Number of Properties as Collateral | property | 1 |  |
Net Book Value of Collateral | $ 22,854 | 20,538 |
Secured Debt | Mortgage notes 3.53% maturing in August 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Principal Balance | $ 620,000 | 620,000 |
Interest rate (as a percent) | 3.53% |  |
Number of Properties as Collateral | property | 1 |  |
Net Book Value of Collateral | $ 724,715 | 745,079 |
Secured Debt | Mortgage notes 6.25% maturing in February 2033 |  |  |
Debt Instrument [Line Items] |  |  |
Principal Balance | $ 1,589 | 1,983 |
Interest rate (as a percent) | 6.25% |  |
Number of Properties as Collateral | property | 1 |  |
Net Book Value of Collateral | $ 4,226 | 4,402 |
Debt issuance costs, net | 25 |  |
Secured Debt | Mortgage notes 4.44% maturing July 2043 |  |  |
Debt Instrument [Line Items] |  |  |
Principal Balance | $ 10,688 | 10,901 |
Interest rate (as a percent) | 4.44% |  |
Number of Properties as Collateral | property | 1 |  |
Net Book Value of Collateral | $ 13,756 | 13,816 |
Secured Debt | Capital leases 7.70% maturing in April 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Principal Balance | $ 8,874 | 9,832 |
Interest rate (as a percent) | 7.70% |  |
Number of Properties as Collateral | property | 2 |  |
Net Book Value of Collateral | $ 18,432 | $ 17,970 |
Joint Venture |  |  |
Debt Instrument [Line Items] |  |  |
Ownership interest by parent |  |  | 55.00%
Joint Venture | Secured Debt | Mortgage notes 3.53% maturing in August 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Ownership interest by parent | 55.00% |  |

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