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Development of building.

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Distributions in Excess of Investment in Unconsolidated Joint Venture

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Equity Method Investment Summarized Financial Information, Borrowings

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Equity Method Investment Summarized Financial Information, Investment

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Equity Method Investment, Summarized Financial Information, Maximum Borrowing Capacity

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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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Area of land held.

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Face (par) amount of debt instrument at time of issuance.

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This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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

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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)	1 Months Ended		3 Months Ended
	Sep. 30, 2016 ft²	Aug. 31, 2016 USD ($) ft²	Mar. 31, 2017 USD ($) a ft² joint_venture	Mar. 31, 2016 USD ($)	Jun. 30, 2013 USD ($) ft² member	Dec. 31, 2016 USD ($)	Sep. 30, 2013 USD ($)
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures			$ 33,692,000			$ 33,803,000
Equity in earnings (loss)			228,000	$ 1,455,000
Equity			33,692,000			33,803,000
Distributions from joint venture			1,952,000
Debt			96,968,000			97,318,000
Distributions in Excess of Investment in Unconsolidated Joint Venture			224,000			0
Promissory note agreement
Schedule of Equity Method Investments [Line Items]
Debt instrument face amount							$ 4,750,000
Line of Credit
Schedule of Equity Method Investments [Line Items]
Summarized financial information, maximum borrowing capacity			$ 52,000,000
Petro Travel Plaza Holdings LLC
Schedule of Equity Method Investments [Line Items]
Unconsolidated joint ventures, voting rights			50.00%
Unconsolidated joint ventures, ownership interest			60.00%
Equity			$ 19,273,000			18,372,000
Debt			$ 15,276,000			15,275,000
Majestic Realty Co.
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures		$ 24,773,000
Number of joint venture contracts \| joint_venture			2
Investment in unconsolidated joint ventures			$ 1,008,000
Area of building owned and leased \| ft²		651,909
Majestic Realty Co. \| Promissory note agreement
Schedule of Equity Method Investments [Line Items]
Debt instrument face amount		$ 21,080,000
TRC-MRC 2 LLC
Schedule of Equity Method Investments [Line Items]
Equity			1,008,000			1,431,000
Debt			$ 21,080,000			21,080,000
Rockefeller Joint Ventures
Schedule of Equity Method Investments [Line Items]
Number of joint venture contracts \| joint_venture			3
Investment in unconsolidated joint ventures			$ 13,411,000
Number of acres for development \| a			91
Development of land in TRCC including pursuing foreign trade zone (up to) \| a			500
Rockefeller Joint Ventures \| Building Development
Schedule of Equity Method Investments [Line Items]
Number of joint venture contracts \| joint_venture			2
Five West Parcel
Schedule of Equity Method Investments [Line Items]
Unconsolidated joint ventures, ownership interest			50.00%
Equity			$ 2,968,000			2,837,000
Area of building owned and leased \| ft²			606,000
Debt			$ 10,116,000			10,251,000
18-19 West LLC
Schedule of Equity Method Investments [Line Items]
Unconsolidated joint ventures, ownership interest			50.00%
Equity			$ 1,749,000			1,741,000
Debt			$ 0			0
Number of acres for development \| a			61.5
TRCC-East
Schedule of Equity Method Investments [Line Items]
Area of building owned and leased \| ft²	480,480
Number of acres for development \| ft²					326,000
TRCC/Rock Outlet Center
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures					$ 87,000,000
Equity			$ 8,694,000			9,198,000
Debt			$ 50,227,000			50,712,000
Construction loan percent of costs					60.00%
Equity contributions, percent					40.00%
Number of members \| member					2
Centennial
Schedule of Equity Method Investments [Line Items]
Debt						$ 0
Consolidated joint venture, ownership interest			85.95%