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Property And Equipment (Summary Of Oil And Gas Properties Not Subject To Amortization) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |
Acquisition costs | $ 621,519 | $ 361,167 | $ 273,146 | $ 522,872
Acquisition costs, total | 1,778,704 |  |  |
Exploration costs | 0 | 0 | 0 | 0
Exploration costs, total | 0 |  |  |
Development costs | 28,833 | 4,688 | 1,436 | 457
Development costs, total | 35,414 |  |  |
Capitalized interest | 3,674 | (2,353) | 2,262 | 0
Capitalized interest, total | 3,583 |  |  |
Total oil and gas properties not subject to amortization | 654,026 | 363,502 | $ 276,844 | $ 523,329
Total oil and gas properties not subject to amortization, total | 1,817,701 | $ 1,465,538 |  |
Utica |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |
Total oil and gas properties not subject to amortization, total | 1,812,256 |  |  |
Niobrara |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |
Total oil and gas properties not subject to amortization, total | 4,932 |  |  |
Southern Louisiana |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |
Total oil and gas properties not subject to amortization, total | 372 |  |  |
Bakken |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |
Total oil and gas properties not subject to amortization, total | 96 |  |  |
Other |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |
Total oil and gas properties not subject to amortization, total | $ 45 |  |  |

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- Definition The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 3(ii)(A) -Article 4 + Details
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- Definition The capitalized costs incurred during the period (excluded from amortization) to obtain access to proved reserves and to provide facilities for extracting, treating, gathering and storing the oil and gas. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 3(ii)(A) -Article 4 + Details
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