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Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Assets and liabilities subject to fair value measurements
Carrying amount	$ 3,800,000	$ 3,200,000
Level 2
Assets and liabilities subject to fair value measurements
Fair value of long-term debt, including current maturities	3,600,000	3,000,000
Recurring
Assets and liabilities subject to fair value measurements
Short-term investments	39,577	147,811
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	39,577	147,811
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	28,546	19,323
Commodity futures - financial liabilities	44,938	6,272
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	28,546	19,323
Commodity futures - financial liabilities	44,938	6,272
Futures \| Recurring \| Level 3 \| Commodity contract
Assets and liabilities subject to fair value measurements
Commodity futures - financial assets
Commodity futures - financial liabilities