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Indebtedness - Schedule of Secured and Other Debt (Details) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) property | Mar. 31, 2017 | Dec. 31, 2016 USD ($) | Jul. 31, 2016 USD ($) building property
Debt Instrument [Line Items] |  |  |  |
Secured debt and capital leases, net | $ 805,404 |  | $ 1,117,649 |
Net Book Value of Collateral | 6,370,286 |  | 6,346,831 |
Fair value adjustment, liabilities | 1,906 |  |  |
Unamortized net premiums |  |  | 3,624 |
Ownership interest by parent |  | 55.00% |  |
MOBs | Secured debt financing due 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of properties as collateral | property |  |  |  | 1
Aggregate principal amount of mortgage debt |  |  |  | $ 620,000
Number of buildings mortgaged | building |  |  |  | 2
Ownership interest by parent |  |  |  | 55.00%
Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt and capital leases, net | $ 807,310 |  | 1,121,273 |
Number of properties as collateral | property | 25 |  |  |
Net Book Value of Collateral | $ 1,135,031 |  | 1,433,561 |
Secured Debt | Mortgages 6.150% maturing in August 2017 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt and capital leases, net | $ 0 |  | 10,653 |
Interest rate (as a percent) | 6.15% |  |  |
Number of properties as collateral | property | 0 |  |  |
Net Book Value of Collateral | $ 0 |  | 14,162 |
Secured Debt | Mortgages 6.73% maturing in April 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt and capital leases, net | $ 0 |  | 8,686 |
Interest rate (as a percent) | 6.73% |  |  |
Number of properties as collateral | property | 0 |  |  |
Net Book Value of Collateral | $ 0 |  | 10,656 |
Secured Debt | Mortgages 6.31% maturing in October 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt and capital leases, net | $ 12,552 |  | 12,772 |
Interest rate (as a percent) | 6.31% |  |  |
Number of properties as collateral | property | 1 |  |  |
Net Book Value of Collateral | $ 16,470 |  | 16,827 |
Secured Debt | Mortgages 6.24% maturing in October 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt and capital leases, net | $ 11,858 |  | 12,061 |
Interest rate (as a percent) | 6.24% |  |  |
Number of properties as collateral | property | 1 |  |  |
Net Book Value of Collateral | $ 15,025 |  | 15,453 |
Secured Debt | Mortgages 4.47% maturing in October 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt and capital leases, net | $ 67,749 |  | 69,953 |
Interest rate (as a percent) | 4.47% |  |  |
Number of properties as collateral | property | 10 |  |  |
Net Book Value of Collateral | $ 175,975 |  | 180,933 |
Secured Debt | Mortgages 4.69% maturing in January 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt and capital leases, net | $ 6,430 |  | 6,565 |
Interest rate (as a percent) | 4.69% |  |  |
Number of properties as collateral | property | 1 |  |  |
Net Book Value of Collateral | $ 9,477 |  | 9,687 |
Secured Debt | Mortgages 3.79% maturing in July 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt and capital leases, net | $ 43,558 |  | 44,462 |
Interest rate (as a percent) | 3.79% |  |  |
Number of properties as collateral | property | 4 |  |  |
Net Book Value of Collateral | $ 62,596 |  | 64,154 |
Secured Debt | Mortgage 6.71% maturing in Sept 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt and capital leases, net | $ 0 |  | 279,505 |
Interest rate (as a percent) | 6.71% |  |  |
Number of properties as collateral | property | 0 |  |  |
Net Book Value of Collateral | $ 0 |  | 235,068 |
Secured Debt | Mortgage 7.49% maturing in January 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt and capital leases, net | $ 2,603 |  | 3,128 |
Interest rate (as a percent) | 7.49% |  |  |
Number of properties as collateral | property | 1 |  |  |
Net Book Value of Collateral | $ 15,099 |  | 15,360 |
Secured Debt | Mortgage 6.28% maturing in July 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt and capital leases, net | $ 13,741 |  | 14,300 |
Interest rate (as a percent) | 6.28% |  |  |
Number of properties as collateral | property | 1 |  |  |
Net Book Value of Collateral | $ 24,414 |  | 24,834 |
Secured Debt | Mortgage 4.85% maturing in October 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt and capital leases, net | $ 11,392 |  | 11,594 |
Interest rate (as a percent) | 4.85% |  |  |
Number of properties as collateral | property | 1 |  |  |
Net Book Value of Collateral | $ 21,065 |  | 21,529 |
Secured Debt | Mortgage 3.53 Percent Due August 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt and capital leases, net | $ 620,000 |  | 620,000 |
Interest rate (as a percent) | 3.53% |  |  |
Number of properties as collateral | property | 1 |  |  |
Net Book Value of Collateral | $ 764,622 |  | 785,805 |
Secured Debt | Mortgage 6.25% maturing in February 2033 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt and capital leases, net | $ 2,395 |  | 2,819 |
Interest rate (as a percent) | 6.25% |  |  |
Number of properties as collateral | property | 1 |  |  |
Net Book Value of Collateral | $ 4,473 |  | 4,267 |
Secured Debt | Mortgage 5.95% maturing in August 2037 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt and capital leases, net | $ 0 |  | 8,882 |
Interest rate (as a percent) | 5.95% |  |  |
Number of properties as collateral | property | 0 |  |  |
Net Book Value of Collateral | $ 0 |  | 8,656 |
Secured Debt | Mortgage 4.38% maturing in September 2043 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt and capital leases, net | $ 4,338 |  | 4,427 |
Interest rate (as a percent) | 4.38% |  |  |
Number of properties as collateral | property | 1 |  |  |
Net Book Value of Collateral | $ 7,290 |  | 7,202 |
Secured Debt | Capital leases |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt and capital leases, net | $ 10,694 |  | 11,466 |
Interest rate (as a percent) | 7.70% |  |  |
Number of properties as collateral | property | 2 |  |  |
Net Book Value of Collateral | $ 18,525 |  | $ 18,968 |

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