Benefit Plans - Unfunded Status (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 43,287	$ 41,367	$ 56,411
Fair value of plan assets	42,459	40,639	$ 49,821
WY Refining
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	25,582	24,730
Fair value of plan assets	22,219	21,940
Underfunded/(overfunded) status	3,363	2,790
Non-current assets	0	0
Non-current liabilities	(3,363)	(2,790)
Net amount recorded	(3,363)	(2,790)
Net actuarial gain (loss)	4,546	5,243
Total accumulated other comprehensive income (loss)	4,546	5,243
U.S. Oil
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	17,705	16,637
Fair value of plan assets	20,240	18,699
Underfunded/(overfunded) status	(2,535)	(2,062)
Non-current assets	2,535	2,062
Non-current liabilities	0	0
Net amount recorded	2,535	2,062
Net actuarial gain (loss)	376	(318)
Total accumulated other comprehensive income (loss)	$ 376	$ (318)