Segment Reporting (Reconciliation of Segment Activity to Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Real estate investments, at cost:
Investments in real estate:	$ 2,182,960	$ 2,053,591
Assets held for sale	10,784	70,839
Cash and cash equivalents	90,534	95,691	$ 63,508
Restricted cash	16,036	15,908	$ 15,270
Derivative assets, at fair value	66	392
Straight-line rent receivable, net	22,321	21,182
Operating lease right-of-use assets	14,335	14,351
Prepaid expenses and other assets	39,651	39,707
Deferred costs, net	14,212	13,642
Total assets	2,390,899	2,325,303
Medical Office Buildings
Real estate investments, at cost:
Investments in real estate:	904,865	891,477
Triple-Net Leased Healthcare Facilities
Real estate investments, at cost:
Investments in real estate:	306,404	305,250
Seniors Housing Communities
Real estate investments, at cost:
Investments in real estate:	$ 971,691	$ 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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