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Investment in and Advances to Non-Consolidated Entities (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 26 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 01, 2012 USD ($) shares | Feb. 28, 2017 USD ($) | Jul. 31, 2014 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) a | Dec. 31, 2016 USD ($) | Jan. 31, 2017
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Non-recourse debt |  |  |  | $ 96,299,000 |  |  |  |
Investment in joint venture |  |  |  | 0 | $ 1,293,000 |  |  |
Equity in earnings of non-consolidated entities |  |  |  | 113,000 | 1,910,000 |  |  |
Joint Venture [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Payments to acquire interest in joint venture |  |  |  |  |  | $ 5,831,000 |  |
Area of real estate property (in acres) | a |  |  |  |  |  | 151 |  |
Houston, TX [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Proceeds from divestiture of interest in joint venture |  |  |  |  |  | $ 49,085,000 |  |
Construction cost |  |  |  |  |  |  | $ 79,964,000 |
Maximum construction financing |  |  |  | $ 56,686,000 |  |  |  |
Houston, TX [Member] | Joint Venture [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 25.00% |  |  |  |
Lexington Realty Trust [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Non-recourse debt |  |  |  | $ 20,816,000 |  |  |  |
LCIF [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Investment in joint venture |  |  |  | 0 | 175,000 |  |  |
Equity in earnings of non-consolidated entities |  |  |  | 252,000 | 100,000 |  |  |
LCIF [Member] | Net Lease Strategic Assets Fund L.P. [Member] | Equity Method Investments [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 2.00% |  |  |  |  |  |  |
Investment in joint venture | $ 189,000 |  |  |  |  |  |  |
Limited partners' capital account, units issued (in units) | shares | 457,211 |  |  |  |  |  |  |
Partnership carrying value in NLS |  |  |  | 5,639,000 |  | 6,175,000 |  |
Equity in earnings of non-consolidated entities |  |  |  | 247,000 | 97,000 |  |  |
Contributions to equity method investment |  |  |  |  | 175,000 |  |  |
Distributions received |  |  |  | $ 783,000 | $ 250,000 |  |  |
LCIF [Member] | Office Building [Member] | Philadelphia, Pennsylvania [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  |  | 1.00% |  |  |  |  |
Investment in non-consolidated entity |  |  | $ 263,000 |  |  |  |  |
Joint Venture [Member] | Houston, TX [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  | $ 50,000,000 |  |
Minimum [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 15.00% |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 25.00% |  |  |  |
Oklahoma City, Oklahoma [Member] | Tenant-in-Common [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  | 40.00%
Proceeds from divestiture of interest in joint venture |  | $ 6,198,000 |  |  |  |  |  |
Gain on sale of properties |  | 1,452,000 |  |  |  |  |  |
Proceeds from collection of loans receivable |  | $ 8,420,000 |  |  |  |  |  |

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The number of limited partner units issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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