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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets:
Fair value of commodity derivatives	$ 11,731	$ 0
Liabilities:
Fair value of commodity derivatives	0	6,127
Recurring \| Significant Other Observable Inputs (Level 2)
Assets:
Fair value of commodity derivatives	11,731
Total assets	11,731
Liabilities:
Fair value of commodity derivatives		6,127
Total liabilities		$ 6,127

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References+ Details