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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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- 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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