Derivative Instruments (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Derivative [Line Items]
Fair Value Asset/(Liability)	$ 50,600		$ 60,700
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net	0	0
Affiliate Balances, Offsetting Derivative Liabilities, Gross Amounts Of Recognized Liabilities	126,000		137,500
Accumulated other comprehensive (loss) income	(48,500)		(33,000)
Unrealized gains (losses) due to natural gas and oil property impairments
Derivative [Line Items]
Accumulated other comprehensive (loss) income	(48,500)
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	(17,000)
Net Deferred Gain (Loss) To Be Reclassified Into Net Income In Later Periods	(31,500)
Other Comprehensive Income (Loss)
Derivative [Line Items]
Unrealized gains (losses) due to natural gas and oil property impairments	70,200
Accounts receivable monetized gains-affiliate
Derivative [Line Items]
Affiliate Balances, Offsetting Derivative Assets, Gross Amounts of Recognized Assets	97,100		129,100
Put premiums payable-affiliate
Derivative [Line Items]
Affiliate Balances, Offsetting Derivative Liabilities, Gross Amounts Of Recognized Liabilities	45,100		45,900
Long-term put premiums payable-affiliate
Derivative [Line Items]
Affiliate Balances, Offsetting Derivative Liabilities, Gross Amounts Of Recognized Liabilities	80,900		91,600
Allocation To Limited Partner Only | Other Comprehensive Income (Loss)
Derivative [Line Items]
Net Derivative Gains (Losses) Limited Partner	4,000
Allocation To Limited Partner Only | Accounts receivable monetized gains-affiliate
Derivative [Line Items]
Affiliate Balances, Offsetting Derivative Assets, Gross Amounts of Recognized Assets	97,100		129,100
Allocation To Limited Partner Only | Put premiums payable-affiliate
Derivative [Line Items]
Affiliate Balances, Offsetting Derivative Liabilities, Gross Amounts Of Recognized Liabilities	45,100		45,900
Allocation To Limited Partner Only | Long-term put premiums payable-affiliate
Derivative [Line Items]
Affiliate Balances, Offsetting Derivative Liabilities, Gross Amounts Of Recognized Liabilities	$ 80,900		$ 91,600