Gas Reserves (details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Gas Reserves [Abstract]
Amended Gas Reserves Agreement Date	Mar. 28, 2014
Cumulative gross investment Jonah Wells	$ 8,000
Gas Reserves Percent Gas Supplies YTD	10.00%		6.00%
Gas Reserves, Current	21,455		18,083		20,646
Gas Reserves Noncurrent Gross	164,115		130,836		140,573
Gas Reserves Amortization	32,370		15,618		18,575
Total Gas Reserves	153,200	[1]	133,301	[1]	142,644	[1]
Deferred Taxes Related To Gas Reserves	33,037		40,553		42,117
Net investment in gas reserves	120,163	[1]	92,748	[1]	100,527	[1]
Total gas reserves investment Jonah Wells	7,800
Net gas reserves investment Jonah Wells	$ 6,500

[1] Total gas reserves includes our investment in additional wells, subject to regulatory deferral approvals, with total gas reserves of $7.8 million and net investment of $6.5 million at September 30, 2014 and no net investment or total gas reserves from additional wells in 2013.