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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 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 + Details
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- Definition 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 + Details
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- Definition 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 -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 + Details
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