Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2017
Related Party Transaction [Line Items]
Related Party Transactions	Related Party Transactions The Company has an indemnity obligation to Vornado Realty Trust ("VNO"), one of its significant shareholders, with respect to actions by the Company that affect Vornado Realty Trust's status as a REIT. All related party acquisitions, sales and loans are approved by the independent members of the Company's Board of Trustees or the Audit Committee. The Company leased a property to an entity in which VNO, a significant shareholder, has an interest. During 2017, 2016 and 2015, the Company recognized $234, $236 and $255, respectively, in rental revenue from this property. This property was sold in 2017. The Company leases its corporate office from an affiliate of Vornado Realty Trust. Rent expense for this property was $1,179, $1,176 and $1,323 in 2017, 2016 and 2015, respectively. In connection with efforts, on a non-binding basis, to procure non-recourse mezzanine financing from an affiliate of the Company's Chairman, pursuant to the terms of the EB-5 visa program administered by the United States Citizenship and Immigration Services (“USCIS”), for a joint venture investment in Houston, Texas, in which the Company has an investment, the Company executed a guaranty in favor of an affiliate of its Chairman. The guaranty provides that the Company will reimburse investors providing the funds for such financing if the following occurs: (1) the joint venture receives such funds, (2) the USCIS denies the financing solely because the project is not permitted under the EB-5 visa program, and (3) the joint venture fails to return such funds. During 2017, USCIS approved the project, and the guaranty terminated by its terms. In addition, the Company obtained non-recourse mezzanine financing in the initial amount of $8,000 from an affiliate of the Company's Chairman, pursuant to the terms of the EB-5 visa program administered by the USCIS, for an investment in Charlotte, North Carolina owned by LCIF. The Company reimbursed the Chairman's affiliate approximately $105 for its expenses and paid a $120 structuring fee to the Chairman's affiliate. The loan may be increased to $12,000 upon certain events.
LCIF [Member]
Related Party Transaction [Line Items]
Related Party Transactions	Related Party Transactions The Partnership had the following related party transactions in addition to related party transactions discussed elsewhere in this report. The Partnership had outstanding net advances owed from/(to) Lexington of $(2,422) and $5,967 as of December 31, 2017 and 2016, respectively. The advances are receivable/payable on demand. Lexington distributions were $61,072, $64,319 and $58,361 during 2017, 2016 and 2015, respectively. In 2017, the Partnership redeemed 2,675,785 OP units owned by Lexington that were entitled to aggregate annual distributions of $3.25 per unit for $129,990. During 2015, the Partnership issued 12,559,130 units to Lexington to satisfy $112,286 of outstanding distributions and advances. The Partnership was allocated interest and amortization expense by Lexington, in accordance with the Partnership agreement, relating to certain of its lending facilities of $8,237, $11,392 and $12,253 for the years ended December 31, 2017, 2016 and 2015, respectively. Lexington, on behalf of the General Partner, pays for certain general administrative and other costs on behalf of the Partnership from time to time. These costs are reimbursable by the Partnership. These costs were approximately $6,557, $9,767 and $8,618 for 2017, 2016 and 2015, respectively. A Lexington affiliate provides property management services for certain Partnership properties. The Partnership recognized property operating expenses of $672, $764 and $905 for the years ended December 31, 2017, 2016 and 2015, respectively, for aggregate fees and reimbursements charged by the affiliate. The Partnership leased a property to an entity in which Vornado Realty Trust, a significant Lexington shareholder, has an interest. During 2017, 2016 and 2015, the Partnership recognized $234, $236 and $255, respectively, in rental revenue from this property. In addition, the Partnership obtained non-recourse mezzanine financing in the initial amount of $8,000 from an affiliate of Lexington's Chairman, who is also the holder of the most OP units other than Lexington, pursuant to the terms of the EB-5 visa program administered by the USCIS, for an investment in Charlotte, North Carolina. The Partnership reimbursed the Chairman's affiliate approximately $105 for its expenses and paid the Chairman's affiliate a $120 structuring fee. The loan may be increased to $12,000 upon certain events.