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Indebtedness - Schedule of Secured and Other Debt (Details) $ in Thousands	Dec. 31, 2018 USD ($) property	Dec. 31, 2017 USD ($)	Mar. 31, 2017	Jul. 31, 2016 USD ($) building property
Debt Instrument [Line Items]
Principal Balance	$ 744,186	$ 805,404
Net Book Value of Collateral	6,341,908	6,370,286
Unamortized net premiums	394
Deb issuance costs		1,906
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
Secured Debt
Debt Instrument [Line Items]
Principal Balance	$ 744,580	807,310
Number of Properties as Collateral | property	15
Net Book Value of Collateral	$ 942,614	1,135,031
Secured Debt | Mortgage notes 6.31% maturing in October 2018
Debt Instrument [Line Items]
Principal Balance	$ 0	12,552
Interest rate (as a percent)	6.31%
Number of Properties as Collateral | property	0
Net Book Value of Collateral	$ 0	16,470
Secured Debt | Mortgage notes 6.24% maturing in October 2018
Debt Instrument [Line Items]
Principal Balance	$ 0	11,858
Interest rate (as a percent)	6.24%
Number of Properties as Collateral | property	0
Net Book Value of Collateral	$ 0	15,025
Secured Debt | Mortgage notes 4.47% maturing in October 2018
Debt Instrument [Line Items]
Principal Balance	$ 0	67,749
Interest rate (as a percent)	4.47%
Number of Properties as Collateral | property	0
Net Book Value of Collateral	$ 0	175,975
Secured Debt | Mortgage notes 4.69% maturing in January 2019
Debt Instrument [Line Items]
Principal Balance	$ 0	6,430
Interest rate (as a percent)	4.69%
Number of Properties as Collateral | property	0
Net Book Value of Collateral	$ 0	9,477
Secured Debt | Mortgage notes 3.79% maturing in July 2019
Debt Instrument [Line Items]
Principal Balance	$ 42,618	43,558
Interest rate (as a percent)	3.79%
Number of Properties as Collateral | property	4
Net Book Value of Collateral	$ 61,199	62,596
Secured Debt | Mortgage notes 7.49% maturing in January 2022
Debt Instrument [Line Items]
Principal Balance	$ 2,037	2,603
Interest rate (as a percent)	7.49%
Number of Properties as Collateral | property	1
Net Book Value of Collateral	$ 14,602	15,099
Secured Debt | Mortgage notes 6.28% maturing July 2022
Debt Instrument [Line Items]
Principal Balance	$ 13,146	13,741
Interest rate (as a percent)	6.28%
Number of Properties as Collateral | property	1
Net Book Value of Collateral	$ 24,064	24,414
Secured Debt | Mortgage notes 4.85% maturing October 2022
Debt Instrument [Line Items]
Principal Balance	$ 11,180	11,392
Interest rate (as a percent)	4.85%
Number of Properties as Collateral | property	1
Net Book Value of Collateral	$ 20,602	21,065
Secured Debt | Mortgage notes 5.75% maturing October 2022
Debt Instrument [Line Items]
Principal Balance	$ 16,441	0
Interest rate (as a percent)	5.75%
Number of Properties as Collateral | property	2
Net Book Value of Collateral	$ 20,342	0
Secured Debt | Mortgage notes 6.64% maturing June 2023
Debt Instrument [Line Items]
Principal Balance	$ 16,442	0
Interest rate (as a percent)	6.64%
Number of Properties as Collateral | property	1
Net Book Value of Collateral	$ 20,538	0
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	$ 745,079	764,622
Secured Debt | Mortgage notes 6.25% maturing in February 2033
Debt Instrument [Line Items]
Principal Balance	$ 1,983	2,395
Interest rate (as a percent)	6.25%
Number of Properties as Collateral | property	1
Net Book Value of Collateral	$ 4,402	4,473
Secured Debt | Mortgage notes 4.44% maturing July 2043
Debt Instrument [Line Items]
Principal Balance	$ 10,901	0
Interest rate (as a percent)	4.444%
Number of Properties as Collateral | property	1
Net Book Value of Collateral	$ 13,816	0
Secured Debt | Mortgage notes 4.38% maturing in September 2043
Debt Instrument [Line Items]
Principal Balance	$ 0	4,338
Interest rate (as a percent)	4.38%
Number of Properties as Collateral | property	0
Net Book Value of Collateral	$ 0	7,290
Secured Debt | Capital leases 7.70% maturing in April 2026
Debt Instrument [Line Items]
Principal Balance	$ 9,832	10,694
Interest rate (as a percent)	7.70%
Number of Properties as Collateral | property	2
Net Book Value of Collateral	$ 17,970	$ 18,525
Joint Venture
Debt Instrument [Line Items]
Ownership interest by parent			55.00%
Joint Venture | MOBs | Secured debt financing due 2026
Debt Instrument [Line Items]
Ownership interest by parent				55.00%

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