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Real Estate (Schedule of Real Estate Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Real Estate Properties [Line Items]
Land, at cost	$ 431,043	$ 422,370
Buildings and improvements, at cost	1,228,608	1,207,066
Less: accumulated depreciation	(357,508)	(347,405)
Real estate, net	1,302,143	1,282,031
Real estate available and held for sale	41,857	68,588
Total real estate	1,344,000	1,350,619
Net Lease
Real Estate Properties [Line Items]
Land, at cost	218,261	219,092
Buildings and improvements, at cost	888,058	888,959
Less: accumulated depreciation	(297,881)	(292,268)
Real estate, net	808,438	815,783
Real estate available and held for sale	0	0
Total real estate	808,438	815,783
Operating Properties
Real Estate Properties [Line Items]
Land, at cost	212,782	203,278
Buildings and improvements, at cost	340,550	318,107
Less: accumulated depreciation	(59,627)	(55,137)
Real estate, net	493,705	466,248
Real estate available and held for sale	41,857	68,588
Total real estate	535,562	534,836
Residential Operating Properties
Real Estate Properties [Line Items]
Real estate available and held for sale	$ 40,900	$ 48,500

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Carrying amount as of the balance sheet date of investments in land and buildings held for sale, including real estate considered to be inventory of the entity.

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Real Estate Investment Property, Held for Use, Net

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- Definition

Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(d))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Amount before accumulated deprecation and depletion of real estate held for productive use and additions or improvements to real estate held for productive use, examples include, but are not limited to, walkways, driveways, fences, and parking lots. Excludes land held for sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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The cumulative amount of depreciation for real estate property held for investment purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(3))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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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.

+ References

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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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