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Real Estate (Schedule of Real Estate Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Real Estate Properties [Line Items]
Land and land improvements, at cost	$ 386,581	$ 439,447
Buildings and improvements, at cost	1,393,238	1,611,094
Less: accumulated depreciation	(405,209)	(456,558)
Real estate, net	1,374,610	1,593,983
Real estate available and held for sale	101,488	137,274
Total real estate	1,476,098	1,731,257
Net Lease
Real Estate Properties [Line Items]
Land and land improvements, at cost	272,227	306,172
Buildings and improvements, at cost	1,091,842	1,183,723
Less: accumulated depreciation	(362,293)	(377,416)
Real estate, net	1,001,776	1,112,479
Real estate available and held for sale	0	0
Total real estate	1,001,776	1,112,479
Operating Properties
Real Estate Properties [Line Items]
Land and land improvements, at cost	114,354	133,275
Buildings and improvements, at cost	301,396	427,371
Less: accumulated depreciation	(42,916)	(79,142)
Real estate, net	372,834	481,504
Real estate available and held for sale	101,488	137,274
Total real estate	474,322	618,778
Residential Operating Properties
Real Estate Properties [Line Items]
Real estate available and held for sale	$ 101,500	$ 137,300

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- Definition

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

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
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-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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