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Contribution for joint venture for future development.

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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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Area of land held.

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

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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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Amount of equity, including noncontrolling interest, reported by an equity method investment of the entity.

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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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 - Additional Information (Details)	1 Months Ended		3 Months Ended		12 Months Ended
	Sep. 30, 2016 ft²	Aug. 31, 2016 USD ($) ft²	Jun. 30, 2015 USD ($)	Jun. 30, 2013 USD ($) ft² member	Dec. 31, 2016 USD ($) a ft² joint_venture	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2013 USD ($)
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures					$ 33,803,000	$ 30,680,000
Equity in earnings (losses)					7,098,000	6,324,000	$ 5,294,000
Equity					99,265,000	94,454,000
Modified share-based awards			$ 1,065,000		$ 0	1,065,000
Area of land to be developed (up to) (in acres) \| a					270,000
Long-term debt					$ 73,866,000
Promissory Note
Schedule of Equity Method Investments [Line Items]
Long-term debt					3,961,000
Face amount								$ 4,750,000
Line of Credit
Schedule of Equity Method Investments [Line Items]
Construction line of credit					$ 52,000,000
Petro Travel Plaza Holdings
Schedule of Equity Method Investments [Line Items]
Unconsolidated joint ventures, voting rights					50.00%
Ownership percentage							60.00%
Investment in unconsolidated joint ventures					$ 18,372,000
Equity					51,287,000	46,710,000
Rockefeller Joint Ventures
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint ventures					$ 13,776,000
Number of joint venture contracts \| joint_venture					3
Number of acres for development \| a					91
Area of land to be developed (up to) (in acres) \| a					500
Five West Parcel
Schedule of Equity Method Investments [Line Items]
Ownership percentage					50.00%
Equity					$ 6,043,000	6,213,000
Area of building owned and leased \| ft²					606,000
18-19 West LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage					50.00%
Equity					$ 4,621,000	4,640,000
Number of acres for development \| a					61.5
Majestic Realty Co.
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures		$ 24,773,000
Investment in unconsolidated joint ventures					$ 1,655,000
Number of joint venture contracts \| joint_venture					2
Area of building owned and leased \| ft²		651,909
Majestic Realty Co. \| Promissory Note
Schedule of Equity Method Investments [Line Items]
Face amount		$ 21,080,000
TRCC-East
Schedule of Equity Method Investments [Line Items]
Number of acres for development \| ft²				326,000
Area of building owned and leased \| ft²	480,480
TRCC/Rock Outlet Center
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures				$ 87,000,000
Equity					$ 34,523,000	36,891,000
Construction loan percent of costs				60.00%
Equity contributions				40.00%
Number of members \| member				2
Centennial-VIE
Schedule of Equity Method Investments [Line Items]
Equity					$ 85,281,000	$ 81,227,000
Consolidated joint venture, ownership interest					84.07%
Building Improvements \| Rockefeller Joint Ventures
Schedule of Equity Method Investments [Line Items]
Number of joint venture contracts \| joint_venture					2