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Investments in Real Estate and Real Estate Under Construction - Narrative (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) Property | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Property
Business Acquisition [Line Items] |  |  |
Aggregate acquisition expenses | $ 329 | $ 1,119 |
Construction in progress | 137,576 |  | $ 95,402
Proceeds from sale of real estate | 293,634 | 156,475 |
Real estate, at cost | 31,312 |  | 16,590
Other assets | 119 |  | 0
Real estate, other liabilities | 2,220 |  | 32
LCIF [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Construction in progress | 32,613 |  | 9,223
Proceeds from sale of real estate | 185,219 | 0 |
Impairment of real estate | 67,935 |  |
Certain Properties [Member] | LCIF [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Proceeds from sale of real estate | 445,565 |  |
Gain on sale of properties | 16,029 |  |
Payments of debt extinguishment costs | $ 7,388 |  |
Number of real estate properties held for sale | Property | 1 |  |
Real estate, at cost | $ 9,714 |  |
Deferred rent receivable | 1,304 |  |
Deferred expense | 610 |  |
Other assets | 9 |  |
Real estate, other liabilities | 2,206 |  |
Development Deals [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Capitalized interest | 5,180 |  | $ 2,726
Equity Method Investments [Member] | Net Lease Strategic Assets Fund L.P. [Member] | LCIF [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Contributions to equity method investment | $ 81 | $ 1,623 |
New York, New York [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Lease term (in years) | 99 years |  |
Deferred rent receivables, written off | $ 91,213 |  |
Number of real estate properties held for sale | Property | 3 |  | 2
New York, New York [Member] | LCIF [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of properties sold | Property | 3 |  |
Lease term (in years) | 99 years |  |
Deferred rent receivables, written off | $ 91,213 |  |

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- Definition Amount, before tax, of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a disposal group. Excludes discontinued operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2443-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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