Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Assets (Liabilities)
Certificates of deposit	$ 0	$ 230
Fair value on a recurring basis [Member]
Assets (Liabilities)
Certificates of deposit		230
Total	(2,753)	4,709
Fair value on a recurring basis [Member] \| Natural Gas [Member]
Assets (Liabilities)
Oil, natural gas and NGL derivatives	192	5,149
Fair value on a recurring basis [Member] \| Oil [Member]
Assets (Liabilities)
Oil, natural gas and NGL derivatives	(2,945)	(670)
Fair value on a recurring basis [Member] \| Level 1 [Member]
Assets (Liabilities)
Certificates of deposit		0
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 1 [Member] \| Oil [Member]
Assets (Liabilities)
Oil, natural gas and NGL derivatives	0	0
Fair value on a recurring basis [Member] \| Level 2 [Member]
Assets (Liabilities)
Certificates of deposit		230
Total	(2,753)	4,709
Fair value on a recurring basis [Member] \| Level 2 [Member] \| Natural Gas [Member]
Assets (Liabilities)
Oil, natural gas and NGL derivatives	192	5,149
Fair value on a recurring basis [Member] \| Level 2 [Member] \| Oil [Member]
Assets (Liabilities)
Oil, natural gas and NGL derivatives	(2,945)	(670)
Fair value on a recurring basis [Member] \| Level 3 [Member]
Assets (Liabilities)
Certificates of deposit		0
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
Fair value on a recurring basis [Member] \| Level 3 [Member] \| Oil [Member]
Assets (Liabilities)
Oil, natural gas and NGL derivatives	$ 0	$ 0

- Definition

A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References+ Details