Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets and liabilities subject to fair value measurements
Commodity futures - financial assets	$ 12,756	$ 5,597
Commodity futures - financial liabilities	9,822	13,601
Carrying amount	3,100,000	3,100,000
Level 2
Assets and liabilities subject to fair value measurements
Fair value of long-term debt, including current maturities	2,600,000	3,300,000
Recurring
Assets and liabilities subject to fair value measurements
Short-term investments	583,211
Recurring \| Level 1
Assets and liabilities subject to fair value measurements
Short-term investments
Recurring \| Level 2
Assets and liabilities subject to fair value measurements
Short-term investments	583,211
Recurring \| Level 3
Assets and liabilities subject to fair value measurements
Short-term investments
Futures \| Recurring \| Commodity contract
Assets and liabilities subject to fair value measurements
Commodity futures - financial assets	12,756	5,597
Commodity futures - financial liabilities	9,822	13,601
Futures \| Recurring \| Level 1 \| Commodity contract
Assets and liabilities subject to fair value measurements
Commodity futures - financial assets
Commodity futures - financial liabilities
Futures \| Recurring \| Level 2 \| Commodity contract
Assets and liabilities subject to fair value measurements
Commodity futures - financial assets	12,756	5,597
Commodity futures - financial liabilities	9,822	13,601
Futures \| Recurring \| Level 3 \| Commodity contract
Assets and liabilities subject to fair value measurements
Commodity futures - financial assets
Commodity futures - financial liabilities

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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