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Business Combinations (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |
Goodwill | $ 714,963,000 | $ 681,358,000 | $ 664,922,000
Asset Retirement Obligation | 446,919,000 | $ 417,575,000 | $ 375,553,000
2020 Acquisition [Member] |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |
Gross Aggregate Consideration | 110,200,000 |  |
Cash Assumed | 1,700,000 |  |
Business Combination, Consideration Transferred | 106,000,000.0 |  |
Business Combination, Indemnity Holdback Liability | 2,500,000 |  |
Business Combination, Current Assets | 54,800,000 |  |
Business Combination, Property, Plant, and Equipment | 27,100,000 |  |
Goodwill | 33,600,000 |  |
Business Combination, Other Intangible Assets | 19,000,000.0 |  |
Business Combination, Current Liabilities | 22,600,000 |  |
Business Combination, Noncurrent Liabilities | 300,000 |  |
Asset Retirement Obligation | $ 1,400,000 |  |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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