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Acquisitions (Schedule of Carry Amount of Net Assets Sold) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Asset Retirement Obligation	$ 3,965
Non-Operated Bay Marchand Field Disposition [Member]
Net property and equipment	35,298
Asset Retirement Obligation	3,959
Other Liabilities	7,311
Net assets sold	$ 24,028

For the disposal group, including a component of the entity (discontinued operation), carrying value (net of accumulated depreciation and any write-downs) of tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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