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Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) (USD $) | Mar. 31, 2012 | Dec. 31, 2011
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Property, Plant And Equipment [Abstract] |  |  |  |
Proved oil and gas properties | $ 1,434,402,000 | [1] | $ 1,152,532,000 | [1]
Less: Accumulated depreciation, depletion, amortization and impairment | (212,831,000) |  | (174,948,000) |
Proved oil and gas properties, net | 1,221,571,000 |  | 977,584,000 |
Unproved oil and gas properties | 81,386,000 |  | 82,825,000 |
Oil and gas properties, net | 1,302,957,000 |  | 1,060,409,000 |
Other property and equipment | 38,660,000 |  | 20,859,000 |
Less: Accumulated depreciation | (2,605,000) |  | (1,313,000) |
Other property and equipment, net | 36,055,000 |  | 19,546,000 |
Total property, plant and equipment, net | 1,339,012,000 |  | 1,079,955,000 |
Asset retirement costs | 14,100,000 |  | 11,400,000 |
Capitalized interest | $ 3,900,000 |  | $ 3,100,000 |
[1] | Included in the Company's proved oil and gas properties are estimates of future asset retirement costs of $14.1 million and $11.4 million at March 31, 2012 and December 31, 2011, respectively. In addition, the Company's proved oil and gas properties include capitalized interest of $3.9 million and $3.1 million at March 31, 2012 and December 31, 2011, respectively.

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- Definition Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Proved Properties -URI http://asc.fasb.org/extlink&oid=6522428 -Topic 932 -SubTopic 360 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59M -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Properties -URI http://asc.fasb.org/extlink&oid=6808249 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6821537&loc=d3e61901-109447 + Details
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- Definition 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; net of accumulated depreciation. 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 8 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 12 -Paragraph 5 -Subparagraph b, c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Oil and Gas properties with proved reserves under the successful effort method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 11 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64746-109465 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Proved Properties -URI http://asc.fasb.org/extlink&oid=6522428 -Topic 932 -SubTopic 360 + Details
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