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Investment in Unconsolidated and Consolidated Joint Ventures (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Investment in Unconsolidated and Consolidated Joint Ventures (Textual) [Abstract] |  |  |  |
Investment in joint ventures | $ 55,112,000 |  | $ 55,112,000 |
Investment in Unconsolidated and Consolidated Joint Ventures (Additional Textual) [Abstract] |  |  |  |
Equity in earnings (losses) of unconsolidated joint ventures, net | 893,000 | 412,000 | 534,000 | (30,000)
Petro Travel Plaza Holdings LLC [Member] |  |  |  |
Investment in Unconsolidated and Consolidated Joint Ventures (Textual) [Abstract] |  |  |  |
Percentage of ownership interest joint ventures | 60.00% |  | 60.00% |
Investment in joint ventures | 9,768,000 |  | 9,768,000 |
Minority investment in joint ventures | 50.00% |  | 50.00% |
Tejon Mountain Village LLC [Member] |  |  |  |
Investment in Unconsolidated and Consolidated Joint Ventures (Textual) [Abstract] |  |  |  |
Percentage of ownership interest joint ventures | 50.00% |  | 50.00% |
Investment in joint ventures | 38,974,000 |  | 38,974,000 |
Rockefeller Joint Ventures [Member] |  |  |  |
Investment in Unconsolidated and Consolidated Joint Ventures (Textual) [Abstract] |  |  |  |
Investment in joint ventures | $ 6,370,000 |  | $ 6,370,000 |
Number of joint venture contracts |  |  | 2 |
Joint venture agreement for development of buildings |  |  | 91 |
Development of land in TRCC including pursuing Foreign Trade Zone | 500 |  | 500 |
Five West Parcel LLC [Member] |  |  |  |
Investment in Unconsolidated and Consolidated Joint Ventures (Textual) [Abstract] |  |  |  |
Percentage of ownership interest joint ventures | 50.00% |  | 50.00% |
Area of building owned and leased |  |  | 606,000 |
18-19 West LLC [Member] |  |  |  |
Investment in Unconsolidated and Consolidated Joint Ventures (Textual) [Abstract] |  |  |  |
Percentage of ownership interest joint ventures | 50.00% |  | 50.00% |
Contribution of land held for future development |  |  | 61.5 |
Centennial Founders, LLC [Member] |  |  |  |
Investment in Unconsolidated and Consolidated Joint Ventures (Textual) [Abstract] |  |  |  |
Percentage of ownership interest joint ventures | 69.44% |  | 69.44% |

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