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Real Estate (Schedule of Real Estate Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Real Estate Properties [Line Items] |  |
Real estate, net | $ 1,282,031 | $ 1,387,274
Real estate available and held for sale | 68,588 | 237,531
Total real estate | 1,350,619 | 1,624,805
Deferred expenses and other assets, net | 141,730 | 162,112
Deferred operating lease income receivable, net | 86,877 | 88,189
Accrued Interest and Operating Lease Income Receivable Net | 11,957 | 11,254
Net Lease |  |
Real Estate Properties [Line Items] |  |
Land, at cost | 219,092 | 231,506
Buildings and improvements, at cost | 888,959 | 987,050
Less: accumulated depreciation | (292,268) | (307,444)
Real estate, net | 815,783 | 911,112
Real estate available and held for sale | 0 | 155,051
Total real estate | 815,783 | 1,066,163
Operating Properties |  |
Real Estate Properties [Line Items] |  |
Land, at cost | 203,278 | 211,054
Buildings and improvements, at cost | 318,107 | 311,283
Less: accumulated depreciation | (55,137) | (46,175)
Real estate, net | 466,248 | 476,162
Real estate available and held for sale | 68,588 | 82,480
Total real estate | 534,836 | 558,642
Real Estate Properties |  |
Real Estate Properties [Line Items] |  |
Land, at cost | 422,370 | 442,560
Buildings and improvements, at cost | 1,207,066 | 1,298,333
Less: accumulated depreciation | (347,405) | (353,619)
Real estate, net | 1,282,031 | 1,387,274
Real estate available and held for sale | 68,588 | 237,531
Total real estate | 1,350,619 | 1,624,805
Residential Operating Properties |  |
Real Estate Properties [Line Items] |  |
Real estate available and held for sale | $ 48,500 | 82,500
Ground Net Lease Business |  |
Real Estate Properties [Line Items] |  |
Real estate, net |  | 104,500
Deferred expenses and other assets, net |  | 37,500
Deferred operating lease income receivable, net |  | 8,200
Accrued Interest and Operating Lease Income Receivable Net |  | $ 3,500

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- Definition 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. + References No definition available. + Details
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- Definition The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property, by the lessor or lessee, respectively. Such receivable is reduced by allowances attributable to, for instance, credit risk associated with a lessee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77913719&loc=d3e40879-112712 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39927-112707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 + Details
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