Commitments and Contingencies Commitments and Contigencies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) MMcf MBbls
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf)	65,484
Dollar Commitment ($ in thousands) | $	$ 80,235
Appalachiain Basin
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf)	45,399
Utica Shale
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf)	20,085
Wattenberg Field
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls	10,262
First Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf)	9,855
Dollar Commitment ($ in thousands) | $	$ 17,573
First Year Commitment [Member] | Appalachiain Basin
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf)	7,117
First Year Commitment [Member] | Utica Shale
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf)	2,738
First Year Commitment [Member] | Wattenberg Field
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls	2,413
Second Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf)	9,855
Dollar Commitment ($ in thousands) | $	$ 16,847
Second Year Commitment [Member] | Appalachiain Basin
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf)	7,117
Second Year Commitment [Member] | Utica Shale
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf)	2,738
Second Year Commitment [Member] | Wattenberg Field
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls	2,413
Third Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf)	9,855
Dollar Commitment ($ in thousands) | $	$ 16,324
Third Year Commitment [Member] | Appalachiain Basin
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf)	7,117
Third Year Commitment [Member] | Utica Shale
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf)	2,738
Third Year Commitment [Member] | Wattenberg Field
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls	2,413
Fourth Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf)	9,881
Dollar Commitment ($ in thousands) | $	$ 16,369
Fourth Year Commitment [Member] | Appalachiain Basin
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf)	7,136
Fourth Year Commitment [Member] | Utica Shale
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf)	2,745
Fourth Year Commitment [Member] | Wattenberg Field
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls	2,420
commitments 5 years and beyond [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf)	26,038
Dollar Commitment ($ in thousands) | $	$ 13,122
commitments 5 years and beyond [Member] | Appalachiain Basin
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf)	16,912
commitments 5 years and beyond [Member] | Utica Shale
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf)	9,126
commitments 5 years and beyond [Member] | Wattenberg Field
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls	603
Supply Contract Expiration Date [Member] | Appalachiain Basin
Supply Commitment
Supply Commitments Contract Expiration Date	Aug. 31, 2022
Supply Contract Expiration Date [Member] | Utica Shale
Supply Commitment
Supply Commitments Contract Expiration Date	Jul. 22, 2023
Supply Contract Expiration Date [Member] | Wattenberg Field
Supply Commitment
Supply Commitments Contract Expiration Date	Jun. 30, 2020