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Derivative Instruments (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Gains (losses) for derivative instruments not designated as hedging instruments      
Realized gains (losses) on derivative instruments $ (62,753) $ (44,414) $ (37,162)
Unrealized gains (losses) on derivative instruments (277) (34,306) (3,788)
Gain (loss) on derivative instruments, net (63,030) (78,720) (40,950)
Interest Rate Swap Agreement [Member]
     
Gains (losses) for derivative instruments not designated as hedging instruments      
Realized gains (losses) on derivative instruments (62,660) (42,495) (36,222)
Unrealized gains (losses) on derivative instruments (9,677) (34,906) (11,143)
Gain (loss) on derivative instruments, net (72,337) (77,401) (47,365)
Toledo Spirit Time Charter Derivative [Member]
     
Gains (losses) for derivative instruments not designated as hedging instruments      
Realized gains (losses) on derivative instruments (93) (1,919) (940)
Unrealized gains (losses) on derivative instruments 9,400 600 7,355
Gain (loss) on derivative instruments, net $ 9,307 $ (1,319) $ 6,415