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Acquisitions (Details) a in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) a | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Business Acquisition [Line Items] |  |  |
Gas and Oil Area, Undeveloped, Gross | a | 34,467 |  |
Payments to Acquire Property, Plant, and Equipment | $ 226,820 | $ 982,934 | $ 1,459,452
Columbia Energy Ventures [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Cost of Acquired Entity, Transaction Costs |  |  | $ 96,106
Payments to Acquire Property, Plant, and Equipment | 9,000 | 50,969 |
Other Liabilities, Current | 3,947 | 8,349 |
Other Long-term Debt, Noncurrent | $ 26,461 | $ 29,333 |

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- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
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- Definition Lease area in which a working interest is owned and on which wells have not been drilled or completed to a point that would permit the production of commercial quantities of oil and gas regardless of whether or not such area contains proved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (b) + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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