Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands					1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 18, 2016 $ / shares	Jun. 30, 2016 USD ($) Rate	Jun. 23, 2016 $ / shares	Mar. 01, 2015 USD ($)	Aug. 04, 2016 USD ($)	Jun. 30, 2016 USD ($) $ / shares shares	Jun. 30, 2015 USD ($) $ / shares	Jun. 30, 2016 USD ($) buildings mezzanine_loan $ / shares shares	Jun. 30, 2015 USD ($) $ / shares	Apr. 01, 2016 USD ($) shares	Dec. 31, 2015 USD ($)
Entity Information [Line Items]
Ownership interest in consolidated subsidiaries (as a percent)								100.00%
Purchase price						$ 679,528		$ 881,900
Percentage of interest held | Rate		97.20%
Operating partnership units redemption ratio								1
Fair value of embedded derivative		$ 6,211				$ 6,211		$ 6,211			$ 8,149
Equity method investment received				$ 5,000
Internal rate of return				15.00%
Cash dividend declared to common shareholders (in dollars per share) | $ / shares			$ 0.225			$ 0.225	$ 0.225	$ 0.45	$ 0.45
Impairment loss						$ 0	$ 0	$ 0	$ 0
Number of mezzanine loans collateralized | mezzanine_loan								7
Number of medical office building developments as collateral for real estate loans receivable | buildings								1
Rental revenue due in excess of amounts currently due from tenants		22,800				22,800		$ 22,800			$ 15,600
Operating Partnership
Entity Information [Line Items]
Purchase price								$ 8,500
Series A Preferred Units
Entity Information [Line Items]
Cumulative preferred return								5.00%
Redemption value (in dollars per share) | $ / shares								$ 200
Units | Operating Partnership
Entity Information [Line Items]
Number of units issued for funding purchase price | shares								174,085
Supplemental disclosure of noncash activity - issuance of OP Units and Series A Preferred Units in connection with acquisitions		$ 2,900				$ 2,900		$ 2,900
OP Units issued to fund the acquisition of the remaining non-controlling interest on a property | shares						217,549
Value of OP Units issued to fund the acquisition of the remaining non-controlling interest on a property						$ 4,000
Minnetonka MOB | Units
Entity Information [Line Items]
Fair value of embedded derivative										$ 2,700
Preferred shares redeemed | shares										44,685
Preferred shares value redeemed										$ 9,800
Subsequent events
Entity Information [Line Items]
Purchase price					$ 30,486
Cash dividend distributed to common shareholders (in dollars per share) | $ / shares	$ 0.225