Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Natural Gas [Member]
Assets (Liabilities)
Oil, natural gas and NGL derivatives	$ 3,201
Fair value on a recurring basis [Member]
Assets (Liabilities)
Total	16,284	$ 55,549
Fair value on a recurring basis [Member] | Natural Gas [Member]
Assets (Liabilities)
Oil, natural gas and NGL derivatives	16,284	55,549
Fair value on a recurring basis [Member] | Level 1 [Member]
Assets (Liabilities)
Total	0	0
Fair value on a recurring basis [Member] | Level 1 [Member] | Natural Gas [Member]
Assets (Liabilities)
Oil, natural gas and NGL derivatives	0	0
Fair value on a recurring basis [Member] | Level 2 [Member]
Assets (Liabilities)
Total	16,284	55,549
Fair value on a recurring basis [Member] | Level 2 [Member] | Natural Gas [Member]
Assets (Liabilities)
Oil, natural gas and NGL derivatives	16,284	55,549
Fair value on a recurring basis [Member] | Level 3 [Member]
Assets (Liabilities)
Total	0	0
Fair value on a recurring basis [Member] | Level 3 [Member] | Natural Gas [Member]
Assets (Liabilities)
Oil, natural gas and NGL derivatives	$ 0	$ 0