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Supplemental Gas Data Capitalized Costs (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Proved Oil and Gas Property, Successful Effort Method | $ 2,016,916 | $ 1,922,602
Unproved Oil and Gas Property, Successful Effort Method | 1,116,282 | 1,421,083
Drilling Cost | 3,583,565 | 3,452,989
Wells and related equipment | 791,996 | 785,744
Gathering assets | 1,138,299 | 1,147,173
Oil and Gas Reclamation Liability, Noncurrent | 176,961 | 115,121
Total Property, Plant and Equipment | 8,824,019 | 8,844,712
Accumulated Depreciation, Depletion and Amortization | (3,099,622) | (2,691,005)
Net Capitalized Costs | 5,724,397 | 6,153,707
Gas Segment [Member] |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Proved Oil and Gas Property, Successful Effort Method |  | 1,922,602
Unproved Oil and Gas Property, Successful Effort Method |  | 1,421,083
Drilling Cost | $ 3,583,565 | $ 3,452,989

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- Definition Amount of accumulated depreciation, depletion, amortization and valuation allowance relating to oil and gas producing activities. + References Reference 1: 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=51678428&loc=d3e61901-109447 + Details
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- Definition The sum of capitalized costs relating to oil and gas producing activities before accounting for accumulated depreciation. + References Reference 1: 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=51678428&loc=d3e61901-109447 + Details
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- Definition Net amount of capitalized costs relating to oil and gas producing activities. + References Reference 1: 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=51678428&loc=d3e61901-109447 + Details
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- Definition Capitalized costs incurred for support equipment and facilities used in oil and gas producing activities (such as seismic equipment, drilling equipment, construction and grading equipment, vehicles, repair shops, warehouses, supply points, camps, and division, district, or field offices). + References Reference 1: 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=51678428&loc=d3e61901-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Support Equipment and Facilities -URI http://asc.fasb.org/extlink&oid=6526041 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61926-109447 + Details
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- Definition Capitalized costs which include those incurred to (1) to drill and equip those exploratory wells and exploratory-type stratigraphic test wells that have found proved reserves and (2) obtain access to proved reserves and provide facilities for extracting, treating, gathering, storing the oil and gas, including the drilling and equipping of development wells and development-type stratigraphic wells and service wells. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Wells and Related Equipment and Facilities -URI http://asc.fasb.org/extlink&oid=6528444 Reference 2: 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=51678428&loc=d3e61901-109447 + Details
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- Definition Amount of a reclamation liability that is associated with a legal obligation for the closure and reclamation of oil and gas properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + 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 Accounting Standards Codification -Topic 932 -SubTopic 360 -Glossary Proved Properties -URI http://asc.fasb.org/extlink&oid=6522428 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=56951519&loc=d3e64746-109465 + Details
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