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Equity Investments (Details) (USD $)
3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Deepwater Gateway, L.L.C. [Member]
Dec. 31, 2012
Deepwater Gateway, L.L.C. [Member]
Jun. 30, 2013
Independence Hub, LLC [Member]
Dec. 31, 2012
Independence Hub, LLC [Member]
Apr. 30, 2012
Clough Helix JV [Member]
Mar. 31, 2012
Clough Helix JV [Member]
Equity method investment, ownership percentage           50.00%   20.00%   50.00%  
Equity investments in unconsolidated affiliates $ 162,839,000   $ 162,839,000   $ 167,599,000 $ 88,500,000 $ 91,400,000 $ 74,400,000 $ 76,200,000    
Capitalized interest           1,300,000 1,300,000 4,400,000 4,600,000    
Exit Fee                     3,000,000
Equity in earnings of investments $ 683,000 $ 5,748,000 $ 1,293,000 $ 6,155,000           $ 3,700,000 $ (3,800,000)