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Investment in and Advances to Non-Consolidated Entities (Details) |  | 1 Months Ended | 12 Months Ended | 26 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 01, 2012 USD ($) shares | Feb. 28, 2017 USD ($) | Jan. 31, 2016 USD ($) | Jul. 31, 2015 USD ($) | Jul. 31, 2014 USD ($) | Dec. 31, 2017 USD ($) a | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) | Jan. 31, 2017 | Jun. 30, 2015
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-recourse debt |  |  |  |  |  | $ 96,603,000 |  |  |  |  |
Payments to acquire interest in joint venture |  |  |  |  |  | 7,951,000 | $ 0 | $ 4,022,000 |  |  |
Aggregate gain on sale of properties |  |  |  |  |  | 63,428,000 | 81,510,000 | 24,884,000 |  |  |
Payments to acquire equity method investments |  |  |  |  |  | 9,898,000 | 37,240,000 | 18,900,000 |  |  |
Equity in earnings (losses) of non-consolidated entities |  |  |  |  |  | (848,000) | 7,590,000 | 1,752,000 |  |  |
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 | a |  |  |  |  |  | 151 |  |  |  |  |
Russellville, Arkansas [Member] | Office Building [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of interest in joint venture |  |  | $ 6,681,000 |  |  |  |  |  |  |  |
Aggregate gain on sale of properties |  |  | $ 5,378,000 |  |  |  |  |  |  |  |
Palm Beach Gardens, Florida [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment charges on real estate |  |  |  |  |  | $ 3,512,000 |  |  |  |  |
Philadelphia, Pennsylvania [Member] | Office Building [Member] | Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire interest in joint venture |  |  |  | $ 4,022,000 |  |  |  |  |  |  |
Houston, Texas [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of interest in joint venture |  |  |  |  |  | 49,085,000 |  |  |  |  |
Joint ventures, construction cost |  |  |  |  |  |  |  |  | $ 79,964,000 |  |
Maximum construction financing |  |  |  |  |  | $ 56,686,000 |  |  |  |  |
Houston, Texas [Member] | Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Co-venture equity ownership percentage |  |  |  |  |  | 25.00% |  |  |  |  |
Oklahoma City, Oklahoma [Member] | Tenant-in-Common [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Co-venture equity ownership percentage |  |  |  |  |  |  |  |  |  | 40.00% | 40.00%
Proceeds from divestiture of interest in joint venture |  | $ 6,198,000 |  |  |  |  |  |  |  |  |
Aggregate gain on sale of properties |  | $ 1,452,000 |  |  |  |  |  |  |  |  |
LCIF [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate gain on sale of properties |  |  |  |  |  | $ 4,491,000 | 36,380,000 | 0 |  |  |
Impairment charges on real estate |  |  |  |  |  | 5,259,000 | 72,072,000 | 787,000 |  |  |
Payments to acquire equity method investments |  |  |  |  |  | 1,737,000 | 81,000 | 1,683,000 |  |  |
Equity in earnings (losses) of non-consolidated entities |  |  |  |  |  | 476,000 | 324,000 | 158,000 |  |  |
LCIF [Member] | Net Lease Strategic Assets Fund L.P. [Member] | Equity Method Investments [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Co-venture equity ownership percentage | 2.00% |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments | $ 189,000 |  |  |  |  |  |  |  |  |  |
Units issued (in shares) | shares | 457,211 |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  | 6,175,000 | 5,224,000 |  | $ 5,224,000 |  |
Equity in earnings (losses) of non-consolidated entities |  |  |  |  |  | 458,000 | 302,000 | 141,000 |  |  |
Contributions to equity method investment |  |  |  |  |  | 1,737,000 | 81,000 |  |  |  |
Proceeds from dividends received |  |  |  |  |  | 1,244,000 | 781,000 | 636,000 |  |  |
LCIF [Member] | Philadelphia, Pennsylvania [Member] | Office Building [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 1.00% |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  | $ 263,000 |  |  |  |  |  |
Lexington Realty Trust [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-recourse debt |  |  |  |  |  | 20,886,000 |  |  |  |  |
Joint Venture [Member] | Houston, Texas [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  | 50,000,000 |  |  |  |  |
Lexington Reality Advisors Inc [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment advisory fees |  |  |  |  |  | $ 807,000 | $ 693,000 | $ 223,000 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Co-venture equity ownership percentage |  |  |  |  |  | 15.00% |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Co-venture equity ownership percentage |  |  |  |  |  | 25.00% |  |  |  |  |

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