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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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