Commitments and Contingencies Commitments and Contigencies (Details) (USD $) In Thousands, unless otherwise specified																									9 Months Ended
	Sep. 30, 2014 MMcf	Sep. 30, 2014 Appalachiain Basin MMcf	Sep. 30, 2014 Utica Shale MMcf	Sep. 30, 2014 Wattenberg Field MBbls	Sep. 30, 2014 First Year Commitment [Member] MMcf	Sep. 30, 2014 First Year Commitment [Member] Appalachiain Basin MMcf	Sep. 30, 2014 First Year Commitment [Member] Utica Shale MMcf	Sep. 30, 2014 First Year Commitment [Member] Wattenberg Field MBbls	Sep. 30, 2014 Second Year Commitment [Member] MMcf	Sep. 30, 2014 Second Year Commitment [Member] Appalachiain Basin MMcf	Sep. 30, 2014 Second Year Commitment [Member] Utica Shale MMcf	Sep. 30, 2014 Second Year Commitment [Member] Wattenberg Field MBbls	Sep. 30, 2014 Third Year Commitment [Member] MMcf	Sep. 30, 2014 Third Year Commitment [Member] Appalachiain Basin MMcf	Sep. 30, 2014 Third Year Commitment [Member] Utica Shale MMcf	Sep. 30, 2014 Third Year Commitment [Member] Wattenberg Field MBbls	Sep. 30, 2014 Fourth Year Commitment [Member] MMcf	Sep. 30, 2014 Fourth Year Commitment [Member] Appalachiain Basin MMcf	Sep. 30, 2014 Fourth Year Commitment [Member] Utica Shale MMcf	Sep. 30, 2014 Fourth Year Commitment [Member] Wattenberg Field MBbls	Sep. 30, 2014 commitments 5 years and beyond [Member] MMcf	Sep. 30, 2014 commitments 5 years and beyond [Member] Appalachiain Basin MMcf	Sep. 30, 2014 commitments 5 years and beyond [Member] Utica Shale MMcf	Sep. 30, 2014 commitments 5 years and beyond [Member] Wattenberg Field MBbls	Sep. 30, 2014 Supply Contract Expiration Date [Member] Appalachiain Basin	Sep. 30, 2014 Supply Contract Expiration Date [Member] Utica Shale	Sep. 30, 2014 Supply Contract Expiration Date [Member] Wattenberg Field	Oct. 14, 2014 PDCM Divestiture MMcf
Supply Commitment
Oil and Gas Delivery Commitments Volumes (MMcf)	215,168	190,973	24,195	12,074	21,730	18,993	2,737	1,210	23,113	20,368	2,745	2,420	23,724	20,987	2,737	2,414	23,724	20,987	2,737	2,414	122,877	109,638	13,239	3,616				134,875
Dollar Commitment ($ in thousands)	$ 127,070				$ 14,101				$ 20,678				$ 20,654				$ 19,508				$ 52,129							$ 30,400
Supply Commitments Contract Expiration Date																									Jan. 31, 2026	Jul. 22, 2023	Mar. 31, 2020