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Real Estate (Schedule of Real Estate Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Real Estate Properties [Line Items]
Land and development	$ 1,001,963	$ 978,962
Real estate, net	1,593,983	1,816,431
Real estate available and held for sale	137,274	167,303
Total real estate	1,731,257	1,983,734
Net Lease
Real Estate Properties [Line Items]
Land and development	306,172	311,890
Buildings and improvements, at cost	1,183,723	1,240,593
Less: accumulated depreciation	(377,416)	(364,323)
Real estate, net	1,112,479	1,188,160
Real estate available and held for sale	0	4,521
Total real estate	1,112,479	1,192,681
Operating Properties
Real Estate Properties [Line Items]
Land and development	133,275	146,417
Buildings and improvements, at cost	427,371	578,013
Less: accumulated depreciation	(79,142)	(96,159)
Real estate, net	481,504	628,271
Real estate available and held for sale	137,274	162,782
Total real estate	618,778	791,053
Real Estate Properties
Real Estate Properties [Line Items]
Land and development	439,447	458,307
Buildings and improvements, at cost	1,611,094	1,818,606
Less: accumulated depreciation	(456,558)	(460,482)
Real estate, net	1,593,983	1,816,431
Real estate available and held for sale	137,274	167,303
Total real estate	$ 1,731,257	$ 1,983,734

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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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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
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-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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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-Name Accounting Standards Codification
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-SubTopic 210
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