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Real Estate (Schedule of Real Estate Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Real Estate Properties [Line Items]
Real estate, net	$ 1,491,752	$ 1,593,983
Real estate available and held for sale	83,764	137,274
Total real estate	1,575,516	1,731,257
Net Lease
Real Estate Properties [Line Items]
Land, at cost	272,666	306,172
Buildings and improvements, at cost	1,111,589	1,183,723
Less: accumulated depreciation	(368,665)	(377,416)
Real estate, net	1,015,590	1,112,479
Real estate available and held for sale	1,284	0
Total real estate	1,016,874	1,112,479
Operating Properties
Real Estate Properties [Line Items]
Land, at cost	211,054	133,275
Buildings and improvements, at cost	311,283	427,371
Less: accumulated depreciation	(46,175)	(79,142)
Real estate, net	476,162	481,504
Real estate available and held for sale	82,480	137,274
Total real estate	558,642	618,778
Real Estate Properties
Real Estate Properties [Line Items]
Land, at cost	483,720	439,447
Buildings and improvements, at cost	1,422,872	1,611,094
Less: accumulated depreciation	(414,840)	(456,558)
Real estate, net	1,491,752	1,593,983
Real estate available and held for sale	83,764	137,274
Total real estate	1,575,516	1,731,257
Residential Operating Properties
Real Estate Properties [Line Items]
Real estate available and held for sale	$ 82,500	$ 137,300

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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 depletion of real estate held for productive use, excluding land held for sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 4
-Subparagraph (e)
-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
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
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