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Investment in Unconsolidated and Consolidated Joint Ventures - Investment Information (Details) ft² in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015 USD ($) a	Jun. 30, 2014 USD ($) ft²	Jun. 30, 2013 member	Jun. 30, 2015 USD ($) a ft² joint_venture	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2013 USD ($)
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 34,362,000			$ 34,362,000		$ 32,604,000
Equity in earnings (losses)	1,656,000	$ 1,148,000		$ 2,806,000	$ 1,586,000
Number of joint venture contracts | joint_venture				3
Long-term debt	$ 78,298,000			$ 78,298,000		81,309,000
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 (losses)				$ 2,751,000	1,534,000
Unconsolidated joint ventures, ownership interest	60.00%			60.00%
Unconsolidated joint ventures, voting rights				50.00%
Long-term debt	$ 15,399,000			$ 15,399,000		15,808,000
Investment in unconsolidated joint ventures	$ 19,198,000			$ 19,198,000
Tejon Mountain Village LLC
Schedule of Equity Method Investments [Line Items]
Equity in earnings (losses)					(35,000)
Rockefeller Joint Ventures
Schedule of Equity Method Investments [Line Items]
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			500
Investment in unconsolidated joint ventures	$ 15,164,000			$ 15,164,000
Five West Parcel LLC
Schedule of Equity Method Investments [Line Items]
Equity in earnings (losses)				$ 236,000	68,000
Unconsolidated joint ventures, ownership interest	50.00%			50.00%
Area of building owned and leased | ft²				606
Long-term debt	$ 11,000,000			$ 11,000,000		11,000,000
18-19 West LLC
Schedule of Equity Method Investments [Line Items]
Equity in earnings (losses)				$ (30,000)	9,000
Unconsolidated joint ventures, ownership interest	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
TRCC/Rock Outlet Center
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures								$ 87,000,000
Construction loan percent of costs			60.00%
Equity contributions, percent			40.00%
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Number of Members | member			2
Equity in earnings (losses)				$ (151,000)	10,000
Unconsolidated joint ventures, voting rights				50.00%
Long-term debt	$ 51,453,000			$ 51,453,000		45,449,000
Centennial Founders, LLC
Schedule of Equity Method Investments [Line Items]
Equity in earnings (losses)				$ 0	$ 0
Consolidated joint venture, ownership interest	74.48%			74.48%
Long-term debt	$ 0			$ 0		$ 0
Building Development | Rockefeller Joint Ventures
Schedule of Equity Method Investments [Line Items]
Number of joint venture contracts | joint_venture				2

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