Segment Reporting (Reconciliation of Segment Activity to Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Real estate investments, at cost:
Investments in real estate, net:	$ 2,053,591	$ 2,171,170
Construction in progress(2)	0	90,829
Cash and cash equivalents	95,691	77,264	$ 94,177
Restricted cash	15,908	14,094
Assets held for sale	70,839	52,397
Derivative assets, at fair value	392	4,633
Straight-line rent receivable, net	21,182	17,351
Operating lease right-of-use assets	14,351
Prepaid expenses and other assets	39,707	28,785
Deferred costs, net	13,642	11,752
Total assets	2,325,303	2,377,446
Medical Office Buildings
Real estate investments, at cost:
Investments in real estate, net:	891,477	878,703
Triple-Net Leased Healthcare Facilities
Real estate investments, at cost:
Investments in real estate, net:	305,250	289,686
Seniors Housing Communities
Real estate investments, at cost:
Investments in real estate, net:	$ 856,864	$ 911,952

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