Gas Reserves and Other Investments (details) (USD $)	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Gas Reserves [Abstract]
Term Of Gas Reserves Contract In Years	30
Gas Reserves Percent Gas Supplies YTD	3.00%
Gas Reserves Current	$ 11,021,000	$ 4,463,000	$ 749,000
Gas Reserves Noncurrent Gross	69,097,000	48,597,000	15,403,000
Gas Reserves Amortization	4,071,000	1,146,000	0
Total Gas Reserves	76,047,000	51,914,000	16,152,000
Deferred Taxes Related To Gas Reserves	26,839,000	15,630,000	3,440,000
Net Gas Reserves Investment	49,208,000	36,284,000	12,712,000
Palomar [Abstract]
Equity Method Investment Ownership Percentage	50.00%
Equity Method Investment Underlying Equity In Net Assets	13,500,000
Equity Method Investment Exposure	$ 13,200,000