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v3.6.0.2

Dispositions (Details) a in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) a | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Payments to Acquire Property, Plant, and Equipment | $ 226,820 | $ 982,934 | $ 1,459,452
Gas and Oil Area, Undeveloped, Gross | a | 34,467 |  |
Gain (Loss) on Disposition of Assets | $ 19,498 | 74,173 | 43,198
Working Capital Adjustment |  | 6,258 |
Industrial Supplies Subsidiary [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  | 51,000
cash flow from investing activities |  |  | 44,035
Gain (Loss) on Disposition of Assets |  |  | 30,845
Western Allegheny Energy [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gain (Loss) on Disposition of Assets | 48,468 |  |
Business Acquisition, Cost of Acquired Entity, Transaction Costs |  | 76,297 |
Certain Loans Acquired in Transfer, Nonaccretable Difference |  | 2,136 |
Accumulated Distributions in Excess of Net Income |  | 10,780 |
Columbia Energy Ventures [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Payments to Acquire Property, Plant, and Equipment | 9,000 | 50,969 |
Business Acquisition, Cost of Acquired Entity, Transaction Costs |  |  | $ 96,106
Other Liabilities, Current | 3,947 | 8,349 |
Other Long-term Debt, Noncurrent | $ 26,461 | $ 29,333 |

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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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