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Development of building.

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

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Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Equity Contributions, Percent

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Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Number of Members

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Lease of building.

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Number of joint venture contracts.

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- Definition

Area of land held.

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

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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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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 - Investment Information (Details) ft² in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) a ft² joint_venture	Mar. 31, 2015 USD ($)	Jun. 30, 2013 USD ($) ft² member	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 32,155,000			$ 30,680,000
Equity in earnings (loss)	1,455,000	$ 1,150,000
Long-term debt	76,153,000			74,215,000
Line of Credit
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity					$ 52,000,000
Petro Travel Plaza Holdings LLC
Schedule of Equity Method Investments [Line Items]
Equity in earnings (loss)	$ 1,375,000	1,160,000
Unconsolidated joint ventures, voting rights	50.00%
Unconsolidated joint ventures, ownership interest	60.00%
Investment in unconsolidated joint ventures	$ 17,000,000
Long-term debt	14,707,000			14,973,000
Rockefeller Joint Ventures
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint ventures	$ 15,155,000
Number of joint venture contracts \| joint_venture	3
Number of acres for development \| a	91
Development of land in TRCC including pursuing foreign trade zone \| a	500
Five West Parcel LLC
Schedule of Equity Method Investments [Line Items]
Equity in earnings (loss)	$ 164,000	91,000
Unconsolidated joint ventures, ownership interest	50.00%
Area of building owned and leased \| ft²	606
Long-term debt	$ 10,585,000			10,725,000
18-19 West LLC
Schedule of Equity Method Investments [Line Items]
Equity in earnings (loss)	$ (22,000)	(1,000)
Unconsolidated joint ventures, ownership interest	50.00%
Long-term debt	$ 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
TRCC/Rock Outlet Center
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures			$ 87,000,000
Equity in earnings (loss)	$ (62,000)	(100,000)
Unconsolidated joint ventures, voting rights			50.00%
Long-term debt	51,325,000			51,557,000
Construction loan percent of costs			60.00%
Equity contributions, percent			40.00%
Number of members \| member			2
Centennial Founders, LLC
Schedule of Equity Method Investments [Line Items]
Equity in earnings (loss)	0	$ 0
Long-term debt	$ 0			$ 0
Consolidated joint venture, ownership interest	75.92%
Building Development \| Rockefeller Joint Ventures
Schedule of Equity Method Investments [Line Items]
Number of joint venture contracts \| joint_venture	2