Acquisitions - Washington Acquisition (Details) mbpd in Thousands, bbl / d in Thousands, shares in Millions, bbl in Millions		1 Months Ended		12 Months Ended
	Jan. 11, 2019 USD ($) mbpd shares bbl	Jan. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020 USD ($) bbl / d	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 09, 2019 USD ($)
Business Acquisition [Line Items]
Oil and gas refinery | bbl / d				150
Issuance of common stock in connection with acquisition	$ 37,000,000.0				$ 36,980,000	$ 19,318,000
Acquisition and integration costs				$ 614,000	4,704,000	10,319,000
Income tax benefit (expense)				$ (20,720,000)	(69,689,000)	333,000
Term Loan | Term Loan B
Business Acquisition [Line Items]
Debt instrument, face amount	$ 250,000,000.0
Term Loan | Par Pacific Term Loan
Business Acquisition [Line Items]
Debt instrument, face amount							$ 45,000,000.0
Washington Refinery Acquisition
Business Acquisition [Line Items]
Oil and gas refinery | mbpd	42
Oil and gas storage capacity | bbl	2.9
Consideration transferred	$ 326,500,000
Payments to acquire businesses	$ 289,500,000
Issuance of common stock in connection with acquisition (in shares) | shares	2.4
Acquisition and integration costs		$ 5,400,000	$ 4,200,000		2,200,000	$ 2,600,000
Revenue					1,200,000,000
Earnings (loss) of acquiree since acquisition date, actual					65,800,000
Income tax benefit (expense)					$ (64,200,000)