Gas Reserves (details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Apr. 28, 2014	Dec. 31, 2013
Gas Reserves [Abstract]
Encana Amendment Date			March 28, 2014
Gas Reserves Percent Gas Supplies YTD	4.00%	3.00%
Gas Reserves, Current	$ 21,990	$ 14,286		$ 20,646
Gas Reserves Noncurrent Gross	156,450	110,033		140,573
Gas Reserves Amortization	21,556	9,864		18,575
Total Gas Reserves	156,884	114,455		142,644
Deferred Taxes Related To Gas Reserves	30,704	32,907		42,117
Net Gas Reserves Investment	$ 126,180	$ 81,548		$ 100,527