Gas Reserves (details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Gas Reserves [Abstract]
Gas Reserves Percent Gas Supplies YTD	6.00%
Gas Reserves, Current	$ 20,646	$ 14,966
Gas Reserves Noncurrent Gross	140,573	92,179
Gas Reserves Amortization	18,575	7,486
Total Gas Reserves	142,644	99,659
Deferred Taxes Related To Gas Reserves	42,117	28,329
Net Gas Reserves Investment	$ 100,527	$ 71,330