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Real Estate (Schedule of Real Estate Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Real Estate Properties [Line Items]
Land, at cost	$ 482,487	$ 483,720
Buildings and improvements, at cost	1,413,775	1,422,872
Less: accumulated depreciation	(419,671)	(414,840)
Real estate, net	1,476,591	1,491,752
Real estate available and held for sale	71,934	83,764
Total real estate	1,548,525	1,575,516
Net Lease
Real Estate Properties [Line Items]
Land, at cost	271,433	272,666
Buildings and improvements, at cost	1,097,049	1,111,589
Less: accumulated depreciation	(370,168)	(368,665)
Real estate, net	998,314	1,015,590
Real estate available and held for sale	0	1,284
Total real estate	998,314	1,016,874
Operating Properties
Real Estate Properties [Line Items]
Land, at cost	211,054	211,054
Buildings and improvements, at cost	316,726	311,283
Less: accumulated depreciation	(49,503)	(46,175)
Real estate, net	478,277	476,162
Real estate available and held for sale	71,934	82,480
Total real estate	550,211	558,642
Residential Operating Properties
Real Estate Properties [Line Items]
Real estate available and held for sale	$ 71,900	$ 82,500

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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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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=28358313&loc=d3e6812-107765

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-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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-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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