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Real Estate (Schedule of Real Estate Assets) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Real Estate Properties [Line Items] |  |  |
Land and land improvements, at cost |  | $ 1,318,555 | $ 1,326,957
Buildings and improvements, at cost |  | 1,650,558 | 1,818,606
Less: accumulated depreciation |  | (478,575) | (468,849)
Real estate, net |  | 2,490,538 | 2,676,714
Real estate available and held for sale | [1] | 296,591 | 285,982
Total real estate |  | 2,787,129 | 2,962,696
Net Lease |  |  |
Real Estate Properties [Line Items] |  |  |
Land and land improvements, at cost |  | 309,522 | 311,890
Buildings and improvements, at cost |  | 1,227,500 | 1,240,593
Less: accumulated depreciation |  | (386,225) | (364,323)
Real estate, net |  | 1,150,797 | 1,188,160
Real estate available and held for sale | [1] | 1,953 | 4,521
Total real estate |  | 1,152,750 | 1,192,681
Operating Properties |  |  |
Real Estate Properties [Line Items] |  |  |
Land and land improvements, at cost |  | 134,490 | 146,417
Buildings and improvements, at cost |  | 423,058 | 578,013
Less: accumulated depreciation |  | (82,821) | (96,159)
Real estate, net |  | 474,727 | 628,271
Real estate available and held for sale | [1] | 136,945 | 162,782
Total real estate |  | 611,672 | 791,053
Land & Development |  |  |
Real Estate Properties [Line Items] |  |  |
Land and land improvements, at cost |  | 874,543 | 868,650
Buildings and improvements, at cost |  | 0 | 0
Less: accumulated depreciation |  | (9,529) | (8,367)
Real estate, net |  | 865,014 | 860,283
Real estate available and held for sale | [1] | 157,693 | 118,679
Total real estate |  | $ 1,022,707 | $ 978,962
[1] | As of September 30, 2015 and December 31, 2014, the Company had $132.8 million and $155.8 million, respectively, of residential properties available for sale in its operating properties portfolio.

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