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Significant Accounting Policies - Impairment of Goodwill and Definite-Lived Intangible Assets (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 03, 2018 | May 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |  |  |  |
Impairment |  |  | $ 473,045,000 | $ 0 | $ 0
Impairment of intangible assets |  |  | 0 | 0 | 18,650,000
Midstream |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Goodwill acquired during period | $ 796,359,000 |  |  |  |
Other intangible assets | $ 128,781,000 |  |  |  |
Customer Relationships |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Impairment of intangible assets |  |  | $ 0 | $ 0 | 18,650,000
Useful life, customer relationship intangible assets |  |  | 17 years |  |
Customer Relationships | Midstream |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Impairment of intangible assets |  | $ 18,650,000 |  |  | $ 18,650,000
Useful life, customer relationship intangible assets |  | 17 years |  |  |
Midstream | Operating Segments | Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Percentage of fair value in excess of carrying amount (less than) |  |  | 10.00% |  |

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266 + Details
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