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Significant Accounting Policies and Practices (Details) ft³ in Billions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 28, 2019 USD ($) ft³
Goodwill and Other Intangibles |  |  |  |
Number of reporting units | segment | 4 |  |  |
Impairment of goodwill | $ 0 | $ 0 | $ 0 |
Impairment of intangible assets | 0 | 0 | 0 |
Debt Issuance Costs |  |  |  |
Debt issuance cost | 592,000 | 3,781,000 | 4,406,000 |
Amortization of debt issuance costs | 3,367,000 | 3,422,000 | $ 4,041,000 |
Accumulated amortization of debt issuance costs | $ 26,022,000 | $ 22,655,000 |  |
Minimum |  |  |  |
Deferred Catalyst Costs |  |  |  |
Catalyst, useful life (in months) | 12 months |  |  |
Deferred Turnaround Costs |  |  |  |
Turnarounds, useful life (in months) | 12 months |  |  |
Maximum |  |  |  |
Deferred Catalyst Costs |  |  |  |
Catalyst, useful life (in months) | 36 months |  |  |
Deferred Turnaround Costs |  |  |  |
Turnarounds, useful life (in months) | 36 months |  |  |
Natural Gas Storage Assets | Discontinued Operations, Disposed of by Sale |  |  |  |
Accounting Policies |  |  |  |
Natural gas storage (in cubic feet) | ft³ |  |  |  | 50
Proceeds from sale of assets |  |  |  | $ 210,067,000

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