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Segment Reporting (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Segment
Dec. 31, 2010
Long Term Fixed-rate time-charter contracts [Member]
Dec. 31, 2010
Short Term Fixed-rate time-charter contracts [Member]
Dec. 31, 2010
FPSO Segment [Member]
Dec. 31, 2009
BP PLC [Member]
Segment Reporting Information [Line Items]          
Number of reportable segments 4        
Revenue related to operations in previous year       $ 59.2  
Minimum Period   1 year 1 year    
Maximum percentage of revenue for BP PLC         10.00%