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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