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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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