Basis of Presentation (Details Textual) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Basis of Presentation [Abstract]
Parent, total ownership percentage		68.00%
Parent, limited partner ownership percentage		66.00%
Parent, general partner ownership percentage		2.00%
Schedule of Equity Method Investments [Line Items]
Equity Method Investment Distributions		$ 13,300,000	$ 4,100,000
Return of capital from unconsolidated affiliates		11,327,000	1,925,000
Payments to Acquire Equity Method Investments		5,806,000	11,460,000
Prior Period Reclassification Adjustment [Abstract]
Prior Period Reclassification Adjustment	2,600,000		4,600,000
Cardinal Pipeline Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		45.00%
Return of capital from unconsolidated affiliates		11,300,000
Payments to Acquire Equity Method Investments		5,800,000	11,500,000
Pine Needle LNG Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		35.00%
Return of capital from unconsolidated affiliates			$ 1,900,000