Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2012

Derivative [Line Items]

Effects of Derivative Instruments on Statements of Operations [Table Text Block]

	Years Ended December 31,
	2012	2011
(Loss) gain recognized in accumulated OCI	$  (7,400)	$         8,400
Gain reclassified from accumulated OCI into loss	$  71,300	$    254,000

Gross Fair Values of Receivable and Payable Affiliate Balances [Table Text Block]

	Gross Amounts of Recognized Assets	Gross Amounts Offset in the Balance Sheets		Net Amount of Assets Presented in the Balance Sheets
Offsetting Derivative Assets
As of December 31, 2012
Accounts receivable monetized gains-affiliate	$      69,000	$       (5,600)	$                 63,400
Long-term receivable monetized gains-affiliate	13,800	(13,800)	—
Total derivative assets	$      82,800	$     (19,400)	$                 63,400
As of December 31, 2011
Accounts receivable monetized gains-affiliate	$    127,400	$              —	$               127,400
Long-term receivable monetized gains-affiliate	83,300	—	83,300
Total derivative assets	$    210,700	$              —	$               210,700

	Gross Amounts of Recognized Liabilities	Gross Amounts Offset in the Balance Sheets		Net Amount of Liabilities Presented in the Balance Sheets
Offsetting Derivative Liabilities
As of December 31, 2012
Put premiums payable-affiliate	$      (5,600)	$         5,600	$                         —
Long-term put premiums payable-affiliate	(16,900)	13,800	(3,100)
Total derivative liabilities	$   (22,500)	$       19,400	$                  (3,100)
As of December 31, 2011
Put premiums payable-affiliate	$             —	$               —	$                         —
Long-term put premiums payable-affiliate	—	—	—
Total derivative liabilities	$             —	$               —	$                         —

Natural Gas Put Options [Member]

Derivative [Line Items]

Commodity Derivatives [Table Text Block]

Natural Gas Put Options

Production
Period Ending			Average	Fair Value
December 31,	Option Type	Volumes	Fixed Price	Asset (2)
		(MMBtu)(1)	(per MMBtu)(1)
2013	Puts purchased	11,800	$             3.45	$                   3,000
2014	Puts purchased	9,800	3.30	3,700
2015	Puts purchased	7,800	4.00	3,700
2016	Puts purchased	7,800	4.15	4,700
				$                 15,100

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(1)	"MMBtu" represents million British Thermal Units.
(2)	Fair value based on forward NYMEX natural gas prices, as applicable.