Property And Equipment (Schedule Of Properties Not Subject To Amortization) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Exploration costs	$ 10,784us-gaap_ExplorationCostsCumulative
Total oil and gas properties not subject to amortization	10,784	368,660
Incurred in 2014 [Member]
Property, Plant and Equipment [Line Items]
Exploration costs	945
Total oil and gas properties not subject to amortization	945
Incurred in 2013 [Member]
Property, Plant and Equipment [Line Items]
Exploration costs	774
Total oil and gas properties not subject to amortization	774
Incurred in 2012 [Member]
Property, Plant and Equipment [Line Items]
Exploration costs	3,087
Total oil and gas properties not subject to amortization	3,087
Incurred prior to 2012 [Member]
Property, Plant and Equipment [Line Items]
Exploration costs	5,978
Total oil and gas properties not subject to amortization	$ 5,978

- Definition

The capitalized costs incurred (excluded from amortization), as of the date of the balance sheet, in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. Exploration costs also include costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, the maintenance of land and lease records, dry hole contributions and bottom hole contributions, costs of drilling and equipping exploratory wells and costs of drilling exploratory-type stratigraphic test wells.

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