Segment Reporting (Reconciliation of Segment Activity to Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Real estate investments, at cost:
Investments in real estate:	$ 2,152,798	$ 2,053,591
Assets held for sale	10,788	70,839
Cash and cash equivalents	83,525	95,691	$ 47,498
Restricted cash	16,248	15,908	$ 17,679
Derivative assets, at fair value	74	392
Straight-line rent receivable, net	22,867	21,182
Operating lease right-of-use assets	14,319	14,351
Prepaid expenses and other assets	35,893	39,707
Deferred costs, net	13,937	13,642
Total assets	2,350,449	2,325,303
Medical Office Buildings
Real estate investments, at cost:
Investments in real estate:	895,253	891,477
Triple-Net Leased Healthcare Facilities
Real estate investments, at cost:
Investments in real estate:	291,184	305,250
Seniors Housing Communities
Real estate investments, at cost:
Investments in real estate:	$ 966,361	$ 856,864

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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