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Income Taxes Net Deferred Tax assets/Liabilities (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits | $ 260,959,000 | $ 257,604,000
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 144,450,000 | 165,951,000
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Asset Retirement Obligations | 39,860,000 | 63,399,000
Deferred Tax Assets, Property, Plant and Equipment | 2,925,000 | 4,404,000
Deferred Tax Assets, Equity Method Investments | 0 | 45,746,000
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 219,872,000 | 143,122,000
deferred tax assets - gas well closing | 68,585,000 | 79,246,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits | 43,997,000 | 44,830,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other | 30,758,000 | 31,544,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions | 42,393,000 | 30,177,000
Deferred Tax Assets, Operating Loss Carryforwards | 74,310,000 | 76,171,000
Deferred Tax Assets, Hedging Transactions | 72,105,000 | 0
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities | 29,532,000 | 44,317,000
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 39,850,000 | 39,850,000
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals | 0 | 14,122,000
Deferred Tax Assets, Other | 66,724,000 | 65,427,000
Deferred Tax Assets, Gross | 1,136,320,000 | 1,105,910,000
Deferred Tax Assets, Valuation Allowance | (282,778,000) | (78,306,000)
Deferred Tax Assets | 853,542,000 | 1,027,604,000
Deferred Tax Liabilities, Property, Plant and Equipment | (782,710,000) | (946,778,000)
Deferred Tax Liabilities, Investment in Noncontrolled Affiliates | (40,200,000) | 0
Deferred Tax Liabilities, Derivatives | 0 | (105,864,000)
Deferred Tax Liabilities, Leasing Arrangements | (22,326,000) | (44,921,000)
Deferred Tax Liabilities, Other | (4,016,000) | (4,670,000)
Deferred Tax Liabilities, Gross | (849,252,000) | (1,102,233,000)
Deferred Tax Liabilities, Net | 4,290,000 | (74,629,000)
Deferred Federal Income Tax Expense (Benefit) | 74,310 | 76,171
Deferred Tax Assets, Valuation Allowance, Noncurrent | 60,488,000 | 42,983,000
Valuation Allowance, Deferred Tax Asset, Change in Amount | $ 10,591,000 | $ 9,420,000

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- Definition Amount of deferred tax liability attributable to taxable temporary differences from investments in unconsolidated subsidiaries and investments in other affiliates which are not controlled nor consolidated. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 + Details
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