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Derivative Instruments (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Gains (losses) for derivative instruments not designated as hedging instruments        
Realized gains (losses) on derivative instruments $ (9,290) $ (10,099) $ (18,401) $ (20,336)
Unrealized gains (losses) on derivative instruments (8,855) (17,230) (15,647) 3,776
Gain (loss) on derivative instruments, net (18,145) (27,329) (34,048) (16,560)
Interest Rate Swap Agreement [Member]
       
Gains (losses) for derivative instruments not designated as hedging instruments        
Realized gains (losses) on derivative instruments (9,284) (10,046) (18,363) (20,283)
Unrealized gains (losses) on derivative instruments (8,855) (16,430) (15,947) 3,376
Gain (loss) on derivative instruments, net (18,139) (26,476) (34,310) (16,907)
Toledo Spirit Time Charter Derivative [Member]
       
Gains (losses) for derivative instruments not designated as hedging instruments        
Realized gains (losses) on derivative instruments (6) (53) (38) (53)
Unrealized gains (losses) on derivative instruments   (800) 300 400
Gain (loss) on derivative instruments, net $ (6) $ (853) $ 262 $ 347