Non-Controlling Interests (Summary of Non-Controlling Interests) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Noncontrolling Interest [Line Items]
Third Party Net Investment Amount	$ 5,410	$ 7,797
Net Real Estate Assets Subject to Investment Arrangement	2,053,591	2,171,170
Distributions	346	492	$ 645
Non-controlling Interests
Noncontrolling Interest [Line Items]
Distributions	346	492	645
Plaza Del Rio Medical Office Campus Portfolio AZ \| Non-controlling Interests
Noncontrolling Interest [Line Items]
Third Party Net Investment Amount	$ 416
Non-Controlling Ownership Percentage	1.90%
Net Real Estate Assets Subject to Investment Arrangement	$ 14,220	14,747
Distributions	0	87	52
UnityPoint Clinic Portfolio \| Non-controlling Interests
Noncontrolling Interest [Line Items]
Third Party Net Investment Amount	$ 496
Non-Controlling Ownership Percentage	5.00%
Net Real Estate Assets Subject to Investment Arrangement	$ 8,842	9,241
Distributions	$ 0	$ 0	$ 0

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(24))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
-Paragraph 1
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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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-SubTopic 10
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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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