Basis of Presentation (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Distribution from unconsolidated affiliates	$ 3,744	$ 1,751
Payments to Pine Needle for repayment of debt	(12,250)	0
Prior Period Adjustment [Abstract]
Prior Period Reclassification Adjustment		$ 9,800
Revenue subject to refund [Abstract]
Reserve for rate refunds	130,752			$ 0
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease liability	89,507
Right-of-use assets	$ 90,023			$ 0
Cardinal Pipeline Company, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	45.00%			45.00%
Pine Needle LNG Company, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	35.00%			35.00%
Payments to Pine Needle for repayment of debt	$ (12,300)
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease liability			$ 91,300
Right-of-use assets			$ 91,300