Acquisitions and Disposition (Details) $ in Thousands																				3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($) state item	Jun. 26, 2015 USD ($)	Jun. 05, 2015 USD ($) shares	Jun. 01, 2015 USD ($)	May. 29, 2015 USD ($)	May. 28, 2015 USD ($)	Apr. 30, 2015 USD ($)	Apr. 15, 2015 USD ($)	Apr. 10, 2015 USD ($)	Mar. 31, 2015 USD ($)	Mar. 27, 2015 USD ($)	Feb. 27, 2015 USD ($)	Feb. 17, 2015 USD ($)	Feb. 13, 2015 USD ($)	Feb. 05, 2015 USD ($) shares	Jan. 29, 2015 USD ($)	Jan. 28, 2015 USD ($) shares	Jan. 23, 2015 USD ($) building	Jan. 22, 2015 USD ($)	Jun. 30, 2015 USD ($) state item shares	Mar. 31, 2015 USD ($) shares	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) state property building item	Jun. 30, 2014 USD ($)	Dec. 31, 2014 building
Acquisitions and Disposition
Acquisition price																							$ 391,056
Acquisition expenses																				$ 2,575		$ 2,045	8,507	$ 6,332
Revenue																				29,683		11,447	54,167	19,479
Net income																				3,297		$ (600)	2,849	$ (4,158)
Fair values of the assets acquired and the liabilities assumed
Land	$ 31,476																			31,476			31,476
Building and improvements	288,461																			288,461			288,461
Lease inducement	2,445																			2,445			2,445
Contingent consideration	(1,482)																			(1,482)			(1,482)
Receivables	3,564																			3,564			3,564
Debt assumed	(18,690)																			(18,690)			(18,690)
Issuance of OP units	(10,734)																			(10,734)			(10,734)
Noncontrolling interest	(5,508)																			(5,508)			(5,508)
Net assets acquired	338,573																			338,573			338,573
Series A Preferred units
Fair values of the assets acquired and the liabilities assumed
Issuance of preferred units																							(9,704)
In-place leases
Fair values of the assets acquired and the liabilities assumed
In-place leases	46,049																			46,049			46,049
Above market leases
Fair values of the assets acquired and the liabilities assumed
In-place leases	11,629																			11,629			11,629
Below market in-place lease
Fair values of the assets acquired and the liabilities assumed
Intangible leases	573																			573			573
Below Market Ground Lease
Fair values of the assets acquired and the liabilities assumed
Intangible leases	1,640																			$ 1,640			$ 1,640
Edina, MN | Medical Building
Acquisitions and Disposition
Acquisition price																			$ 14,190
Savage, MN | Medical Building
Acquisitions and Disposition
Acquisition price																			12,800
Crystal, MN | Medical Building
Acquisitions and Disposition
Acquisition price																			14,782
Chanhassen, MN | Medical Building
Acquisitions and Disposition
Acquisition price																			$ 6,410
Vadnais Heights, MN | Medical Building
Acquisitions and Disposition
Acquisition price																$ 18,422
Minnetonka, MN | Series A Preferred units
Acquisitions and Disposition
Number of units issued for funding purchase price | shares															44,685
Value of units issued for funding purchase price															$ 9,700
Minnetonka, MN | Medical Building
Acquisitions and Disposition
Acquisition price													$ 10,882		26,000
Jamestown, ND
Acquisitions and Disposition
Number of medical office buildings | building																							1
Jamestown, ND | Medical Building
Acquisitions and Disposition
Acquisition price															$ 12,819
Columbus, GA
Acquisitions and Disposition
Number of medical office buildings | building																		13							12
Acquisition price																		$ 34,500
Columbus, GA | Medical Building
Acquisitions and Disposition
Acquisition price																		$ 6,540
Greenwood, IN | Medical Building
Acquisitions and Disposition
Acquisition price														$ 17,183			$ 10,000
Acquisition costs capitalized																	$ 300
Lakewood, WA | Medical Center
Acquisitions and Disposition
Acquisition price												$ 13,750
Dallas, TX | Cancer Center
Acquisitions and Disposition
Acquisition price												$ 8,200
Milwaukee, WI | Medical Building
Acquisitions and Disposition
Acquisition price											$ 6,500
Rochester, NY | Medical Building
Acquisitions and Disposition
Acquisition price										$ 41,000
Avalon Park, FL | Medical Building
Acquisitions and Disposition
Acquisition price										14,600
Louisville, KY | Surgical Center
Acquisitions and Disposition
Acquisition price									$ 8,000
Baton Rouge, LA | Medical Building
Acquisitions and Disposition
Acquisition price								$ 10,486
Grand Blanc, MI | Medical Center
Acquisitions and Disposition
Acquisition price							$ 18,913
Jacksonville, FL | Medical Building
Acquisitions and Disposition
Acquisition price							$ 19,000
Jacksonville, FL | Medical Building | Mezzanine loan
Acquisitions and Disposition
Acquisition price				$ 9,000
Sheffield, OH | Medical Center
Acquisitions and Disposition
Acquisition price						$ 11,236
Livonia, MI | Medical Building
Acquisitions and Disposition
Acquisition price					$ 14,750
Coon Rapids, MN | Medical Center
Acquisitions and Disposition
Acquisition price				$ 7,298
Bloomington, IN | Medical Building
Acquisitions and Disposition
Acquisition price			$ 11,308
Palm Beach, FL | Ambulatory Surgical Center (ASC)
Acquisitions and Disposition
Acquisition price		$ 14,070
Jacksonville, AL | Physician Center
Acquisitions and Disposition
Acquisition price	2,800
Jackson, TN | Woman's Clinic
Acquisitions and Disposition
Acquisition price	5,672
Hanover, PA | Medical Center
Acquisitions and Disposition
Acquisition price	$ 11,400
Elgin, IL
Acquisitions and Disposition
Number of condominium units acquired | item																							14
Total number of condominium units | item	19																			19			19
Elgin, IL | Medical Building
Acquisitions and Disposition
Acquisition price	$ 13,045
Minneapolis, St. Paul
Acquisitions and Disposition
Number of medical office buildings | building																							7
2015 acquisitions
Acquisitions and Disposition
Number of medical office buildings | property																							36
Number of states | state	17																			17			17
Revenue																				$ 7,400			$ 10,200
Net income																				1,300			$ 1,900
2015 acquisitions | Maximum
Acquisitions and Disposition
Minority interest in property holding entities																							1.00%
Operating Partnership
Acquisitions and Disposition
Acquisition price																				$ 11,300	$ 10,000
Operating Partnership | Units
Acquisitions and Disposition
Number of units issued for funding purchase price | shares																				210,820	420,963
Value of units issued for funding purchase price	$ 3,400									$ 7,300										$ 3,400	$ 7,300		$ 3,400
Operating Partnership | Greenwood, IN | Units
Acquisitions and Disposition
Number of units issued for funding purchase price | shares																	420,963
Value of units issued for funding purchase price																	$ 7,300
Operating Partnership | Bloomington, IN | Units
Acquisitions and Disposition
Number of units issued for funding purchase price | shares			210,820
Value of units issued for funding purchase price			$ 3,400
1ST Quarter
Fair values of the assets acquired and the liabilities assumed
Land	21,075																			21,075			21,075
Building and improvements	175,050																			175,050			175,050
Lease inducement	462																			462			462
Contingent consideration	(1,482)																			(1,482)			(1,482)
Receivables	3,564																			3,564			3,564
Debt assumed	(6,323)																			(6,323)			(6,323)
Issuance of OP units	(7,314)																			(7,314)			(7,314)
Noncontrolling interest	(5,508)																			(5,508)			(5,508)
Net assets acquired	205,740																			205,740			205,740
1ST Quarter | Series A Preferred units
Fair values of the assets acquired and the liabilities assumed
Issuance of preferred units																							(9,704)
1ST Quarter | In-place leases
Fair values of the assets acquired and the liabilities assumed
In-place leases	32,398																			32,398			32,398
1ST Quarter | Above market leases
Fair values of the assets acquired and the liabilities assumed
In-place leases	3,679																			3,679			3,679
1ST Quarter | Below market in-place lease
Fair values of the assets acquired and the liabilities assumed
Intangible leases	315																			315			315
1ST Quarter | Below Market Ground Lease
Fair values of the assets acquired and the liabilities assumed
Intangible leases	158																			158			158
2nd Quarter
Fair values of the assets acquired and the liabilities assumed
Land	10,401																			10,401			10,401
Building and improvements	113,411																			113,411			113,411
Lease inducement	1,983																			1,983			1,983
Debt assumed	(12,367)																			(12,367)			(12,367)
Issuance of OP units	(3,420)																			(3,420)			(3,420)
Net assets acquired	132,833																			132,833			132,833
2nd Quarter | In-place leases
Fair values of the assets acquired and the liabilities assumed
In-place leases	13,651																			13,651			13,651
2nd Quarter | Above market leases
Fair values of the assets acquired and the liabilities assumed
In-place leases	7,950																			7,950			7,950
2nd Quarter | Below market in-place lease
Fair values of the assets acquired and the liabilities assumed
Intangible leases	258																			258			258
2nd Quarter | Below Market Ground Lease
Fair values of the assets acquired and the liabilities assumed
Intangible leases	$ 1,482																			$ 1,482			$ 1,482