Summary of Significant Accounting Policies - Noncontrolling Interests (Details)				12 Months Ended
	Mar. 01, 2018 USD ($)	Jan. 09, 2018 USD ($) shares	Feb. 05, 2015 $ / shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) properties shares	Dec. 31, 2016 USD ($)	Mar. 01, 2015 USD ($)
Business Acquisition [Line Items]
Number of units issued for funding purchase price (in shares) | shares		104,172
Value of units issued for funding purchase price		$ 22,700,000
Acquisition price				$ 271,000,000	$ 1,414,179,000
Conversion ratio				1
Embedded derivative				$ 3,673,000	0
Equity investment							$ 5,000,000
Net income (loss) attributable to redeemable noncontrolling interest	$ 6,400,000
Impairment loss				0	965,000	$ 0
Operating Partnership
Business Acquisition [Line Items]
Acquisition price					78,600,000
Impairment loss				0	$ 965,000	$ 0
Units | Operating Partnership
Business Acquisition [Line Items]
Number of real estate properties acquired | properties					1
Number of units issued for funding purchase price (in shares) | shares					2,247,817
Value of units issued for funding purchase price					$ 44,300,000
Noncontrolling interest, decrease from redemptions or purchase of interests					700,000
Series A Preferred units
Business Acquisition [Line Items]
Value of units issued for funding purchase price				$ 22,651,000	$ 0
Cumulative preferred return			5.00%
Shares issued upon conversion			1
Redemption value per share | $ / shares			$ 200
Period of time before redeemable			1 year
Joint venture, Operating Partnership and Medical Center of New Albany I, LLC | Units | Operating Partnership
Business Acquisition [Line Items]
Number of shares (in shares) | shares					38,641
HealthEast Clinic & Specialty Center
Business Acquisition [Line Items]
Number of units issued for funding purchase price (in shares) | shares		104,172		104,172	0
Value of preferred units		$ 22,700,000
Embedded derivative				$ 3,700,000
Physicians Realty Trust
Business Acquisition [Line Items]
Percentage of interest held				97.20%	97.10%