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v2.4.0.6

Other Information (Details Textual) (USD $) Share data in Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2007 | Feb. 28, 2011 | Dec. 31, 2011 Skaugen [Member] | Dec. 31, 2011 Excalibur and Excelsior [Member] | Nov. 04, 2010 Excalibur and Excelsior [Member]
Other Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |
Percentage of ownership in joint venture | 50.00% |  |  |  |  |  |  | 50.00% | 50.00%
Expenditures for vessels and equipment |  | $ 64,685,000 | $ 26,652,000 | $ 134,926,000 |  |  | $ 33,000,000 |  |
Percentage of equity interest guaranteed secured debt |  |  |  |  |  |  |  |  | 50.00%
Remaining equity purchase price |  | 19,000,000 |  |  |  | 1,300,000,000 |  |  | 72,500,000
Amount of debt secured by joint ventures |  |  |  |  |  |  |  |  | 206,000,000
Other Information (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |
Fixed-rate charter period |  | 15 years |  |  | 20 years |  |  |  |
Proceeds received from sale of vessel | 21,556,000 |  | 21,556,000 |  |  |  |  |  |
Gain on sale of vessel | 4,340,000 |  | 4,340,000 |  |  |  |  |  |
Purchase price financed by issue of common stock | 37,300,000 |  |  |  |  |  |  |  |
Number of common units issued | 1.1 |  |  |  |  |  |  |  |
Excess of investment in joint ventures over its underlying equity | $ 51,000,000 |  |  |  |  |  |  |  |

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