Summary of Significant Accounting Policies (Details 2) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended				9 Months Ended
	Feb. 05, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Noncontrolling Interests
Impairment loss		$ 0			$ 250	$ 0	$ 250
Purchase price						$ 297,131
Operating partnership units redemption ratio						1
Minnetonka MOB
Noncontrolling Interests
Cumulative preferred return	15.00%
Equity method investment received	$ 5,000
Investor's percentage of internal rate of return	15.00%
Minnetonka MOB | Series A Preferred units
Noncontrolling Interests
Number of units issued for funding purchase price	44,685
Value of units issued for funding purchase price	$ 9,700
Fair value of embedded derivative		3,400				$ 3,400
Redemption value (in dollars per share)						$ 200
Cumulative preferred return						5.00%
Operating Partnership
Noncontrolling Interests
Purchase price		$ 11,200	$ 11,300	$ 10,000
Percentage of interest held						94.90%
Operating Partnership | Units
Noncontrolling Interests
Number of units issued for funding purchase price		16,866	210,820	420,963
Value of units issued for funding purchase price		$ 200	$ 3,400	$ 7,300		$ 200