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Real Estate (Schedule of Real Estate Assets) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Real Estate Properties [Line Items] |  |  |
Land, at cost | $ 497,777 |  | $ 422,370
Buildings and improvements, at cost | 1,739,516 |  | 1,207,066
Less: accumulated depreciation | (343,504) |  | (347,405)
Real estate, net | 1,893,789 |  | 1,282,031
Real estate available and held for sale | 61,549 |  | 68,588
Total real estate | 1,955,338 |  | 1,350,619
Net Lease |  |  |
Real Estate Properties [Line Items] |  |  |
Land, at cost | 334,818 |  | 219,092
Buildings and improvements, at cost | 1,511,844 |  | 888,959
Less: accumulated depreciation | (302,887) |  | (292,268)
Real estate, net | 1,543,775 |  | 815,783
Real estate available and held for sale | 7,289 |  | 0
Total real estate | 1,551,064 |  | 815,783
Net Lease | Net Lease Venture |  |  |
Real Estate Properties [Line Items] |  |  |
Real estate, net |  | $ 743,600 |
Operating Properties |  |  |
Real Estate Properties [Line Items] |  |  |
Land, at cost | 162,959 |  | 203,278
Buildings and improvements, at cost | 227,672 |  | 318,107
Less: accumulated depreciation | (40,617) |  | (55,137)
Real estate, net | 350,014 |  | 466,248
Real estate available and held for sale | 54,260 |  | 68,588
Total real estate | 404,274 |  | 534,836
Residential Operating Properties |  |  |
Real Estate Properties [Line Items] |  |  |
Real estate available and held for sale | $ 29,500 |  | $ 48,500

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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=82887183&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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