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Asset Retirement Obligations (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Liabilities incurred during the period | $ 9,800 | $ 9,809 |
ARO capitalized as property, plant and equipment |  | 9,800 |
Bellaire |  |  |
Segment Reporting Information [Line Items] |  |  |
Fair value of trust assets | 10,300 | 10,300 | $ 10,100
Centennial |  |  |
Segment Reporting Information [Line Items] |  |  |
Reduction in asset retirement obligation | 4,800 |  |
Cash paid | 1,900 |  |
Settlement receivable from third parties | 1,400 | 1,400 |
Accounts payable, cash to be paid to settle | 1,900 | 1,900 |
Other long-term liabilities, contingent and noncontingent guarantee liabilities | 2,400 | 2,400 |
Centennial | Surety Bond |  |  |
Segment Reporting Information [Line Items] |  |  |
Surety bonds outstanding to be transferred or replaced | 10,700 | 10,700 |
Centennial | Third Party | Surety Bond | Transfer Or Replacement Period One |  |  |
Segment Reporting Information [Line Items] |  |  |
Surety bonds outstanding to be transferred or replaced | 4,900 | 4,900 |
Centennial | Third Party | Surety Bond | Transfer Or Replacement Period Two |  |  |
Segment Reporting Information [Line Items] |  |  |
Surety bonds outstanding to be transferred or replaced | $ 5,800 | $ 5,800 |

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- Definition Amount of cash paid during the period to settle an asset retirement obligation. Amounts paid to settle an asset retirement obligation are generally included in the operating section of the Statement of Cash Flows. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585 + Details
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- Definition Carrying amount of an asset that is legally restricted for purposes of settling an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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