Contribution for joint venture for future development.

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- Definition

Development of building.

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- Definition

Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Construction Loan Costs, Percent

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- Definition

Lease of building.

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No definition available.

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- Definition

Number of joint venture contracts.

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- Definition

Percentage Leased

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No definition available.

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- Definition

Area of land held.

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- Definition

This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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-Name Accounting Standards Codification
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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.

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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- Definition

Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Investment in Unconsolidated and Consolidated Joint Ventures - Additional Information (Details) ft² in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2015 USD ($) a	Jun. 30, 2013 USD ($) ft²	Dec. 31, 2015 USD ($) a ft² joint_venture	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 30,680,000		$ 30,680,000	$ 32,604,000
Equity in earnings (losses)			$ 6,324,000	5,294,000	$ 4,006,000
Number of joint venture contracts \| joint_venture			3
Area of land to be developed (up to) (in acres) \| a	270,000		270,000
Long-term debt	$ 74,215,000		$ 74,215,000
Percentage leased	100.00%
Line of Credit
Schedule of Equity Method Investments [Line Items]
Line of credit	$ 52,000,000		52,000,000
Petro Travel Plaza Holdings
Schedule of Equity Method Investments [Line Items]
Equity in earnings (losses)			$ 6,377,000	$ 4,937,000
Unconsolidated joint ventures, voting rights			50.00%
Ownership percentage				60.00%
Investment in unconsolidated joint ventures	15,626,000		$ 15,626,000
Long-term debt	14,973,000		14,973,000	$ 15,808,000
Rockefeller Joint Ventures
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures		$ 335,000
Investment in unconsolidated joint ventures	$ 15,054,000		$ 15,054,000
Number of joint venture contracts \| joint_venture			2
Number of acres for development \| a			91
Area of land to be developed (up to) (in acres) \| a	500		500
Five West Parcel
Schedule of Equity Method Investments [Line Items]
Equity in earnings (losses)			$ 542,000	221,000
Ownership percentage	50.00%		50.00%
Area of building owned and leased \| ft²			606
Long-term debt	$ 10,725,000		$ 10,725,000	11,000,000
18-19 West LLC
Schedule of Equity Method Investments [Line Items]
Equity in earnings (losses)			$ (54,000)	7,000
Ownership percentage	50.00%		50.00%
Long-term debt	$ 0		$ 0	0
Number of acres for development \| a			61.5
TRCC-East
Schedule of Equity Method Investments [Line Items]
Number of acres for development \| ft²		326
Capital contribution at cost		$ 2,159,000
TRCC/Rock Outlet Center
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures		87,000,000
Equity in earnings (losses)			$ (541,000)	164,000
Investment in unconsolidated joint ventures		$ 10,558,000
Construction loan percent of costs		60.00%
Long-term debt	$ 51,557,000		51,557,000	45,449,000
Centennial-VIE
Schedule of Equity Method Investments [Line Items]
Equity in earnings (losses)			$ 0	0
Long-term debt				$ 0
Consolidated joint venture, ownership interest	75.57%		75.57%