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Investment in and Advances to Non-Consolidated Entities (Details) - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Nov. 30, 2014 | Jun. 30, 2014 | Aug. 31, 2013 | Jun. 30, 2015 | Jun. 30, 2014
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Advances to affiliate | $ 47,904 |  |  |  | $ 47,904 |
Impairment of real estate |  |  |  |  | 1,252 | $ 16,400
Investment in joint venture |  |  |  |  | $ 10,005 | $ 0
Houston, TX [Member] |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Anticipated construction cost |  | $ 86,491 |  |  |  |
Maximum construction financing |  | $ 56,686 |  |  |  |
Tenant-in-Common [Member] | Oklahoma City, Oklahoma [Member] |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Investment in joint venture | $ 5,613 |  |  |  |  |
Joint Venture [Member] | Office Building [Member] |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Impairment of real estate |  |  | $ 650 |  |  |
Joint Venture [Member] | Houston, TX [Member] |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Ownership percentage of equity method investment | 25.00% |  |  |  | 25.00% |
Lease term (years) |  | 20 years |  |  |  |
Joint Venture [Member] | Baltimore, Maryland [Member] |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Lease term (years) |  |  |  | 99 years |  |
Investment in joint venture |  |  |  | $ 5,000 |  |
Lexington Realty Trust [Member] |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Advances to affiliate | $ 8,647 |  |  |  | $ 8,647 |
Minimum [Member] |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Ownership percentage of equity method investment | 15.00% |  |  |  | 15.00% |
Maximum [Member] |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Ownership percentage of equity method investment | 40.00% |  |  |  | 40.00% |
Mortgages [Member] |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Stated interest rate, minimum |  |  |  |  | 3.70% |
Stated interest rate, maximum |  |  |  |  | 4.70% |

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- Definition Long-Term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. This does not include advances to clients. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.2) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2 -Article 6 + Details
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