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Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |  |
Depreciation, depletion and amortization | $ 501,821 | $ 508,463 | $ 493,423
Building and Improvements | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of property, plant and equipment | 10 years |  |
Building and Improvements | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of property, plant and equipment | 45 years |  |
Machinery and Equipment | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of property, plant and equipment | 3 years |  |
Machinery and Equipment | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of property, plant and equipment | 25 years |  |
Gathering and Transmission | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of property, plant and equipment | 30 years |  |
Gathering and Transmission | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of property, plant and equipment | 40 years |  |
Gas Properties |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation, depletion and amortization | $ 400,758 | $ 423,488 | $ 412,588
Purchased Software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of property, plant and equipment | 7 years |  |

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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