Derivative Instruments (Commodity Derivatives) (Details)		6 Months Ended
		Jun. 30, 2016 USD ($) MMBTU $ / MMBTU	Dec. 31, 2015 USD ($)
Derivative [Line Items]
Fair Value Asset		$ 14,500	$ 45,000
Natural Gas Put Options Production Period Ending December 31, 2016 | Designated as Hedging Instrument
Derivative [Line Items]
Volumes (MMBtu) | MMBTU	[1],[2]	12,800
Average Fixed Price (per MMBtu) | $ / MMBTU	[2]	4.15
Fair Value Asset	[3]	$ 14,500

[1] The production volume for 2016 include the remaining six months of 2016 beginning July 1, 2016.

[2] “MMBtu” represents million British Thermal Units.

[3] Fair value based on forward NYMEX natural gas prices, as applicable.