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Accounting Policy (Impairment of Sabine Plant) (Details Textuals) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2013 Sabine Plant [Member]	Dec. 31, 2012 Sabine Plant [Member]	Sep. 30, 2012 Sabine Plant [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Potential Impairment Of Long Lived Assets							$ 26,400,000
Property Plant And Equipment Net 1							19,000,000
Depreciation And Amortization	$ 45,078,000	$ 31,930,000	$ 110,163,000	$ 93,257,000	$ 8,800,000	$ 8,800,000	$ 8,800,000

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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