Accrued And Other Liabilities (Schedule Of Accrued And Other Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Accrued And Other Liabilities [Line Items]
Accrued lease operating expense	$ 16,604	$ 11,173
Accrued capital spending	17,674	6,109
Senior notes accrued interest	11,563	11,563
Accrued production and other taxes	7,352	7,401
Gas imbalance liability	4,913	5,351
Other	2,910	1,187
Total accrued and other liabilities	64,516	46,284
Class C Preferred Convertible Unitholder [Member]
Accrued And Other Liabilities [Line Items]
Distributions payable	$ 3,500	$ 3,500

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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