Condensed Consolidated Statement of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 312,100	$ 32,400
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	98,700	81,100
Stock-based compensation	7,100	4,300
Change in fair value of catalyst leases	3,100	0
Deferred income taxes	(7,200)	(700)
Non-cash change in inventory repurchase obligations	14,200	8,800
Non-cash lower of cost or market inventory adjustment	(506,000)	(87,700)
Pension and other post-retirement benefit costs	11,200	11,800
Income from equity method investee	4,700	4,000
Distributions from equity method investee	4,700	4,000
Loss on sale of assets	0	100
Changes in operating assets and liabilities:
Accounts receivable	(152,700)	121,400
Due to/from affiliates	10,300	(5,400)
Inventories	(194,700)	(278,300)
Prepaid and other current assets	(70,000)	(36,200)
Accounts payable	40,600	32,200
Accrued expenses	213,300	(22,900)
Deferred revenue	46,500	(2,000)
Other assets and liabilities	(11,500)	(6,000)
Net cash used in operating activities	(185,000)	(147,100)
Cash flows from investing activities:
Expenditures for property, plant and equipment	(94,200)	(21,000)
Expenditures for deferred turnaround costs	(133,000)	(58,800)
Expenditures for other assets	(22,200)	(9,500)
Equity method investment - return of capital	1,800	1,000
Net cash used in investing activities	(247,600)	(88,300)
Cash flows from financing activities:
Distributions to members	(23,000)	0
Repayments of Long-term Debt	(1,700)
Proceeds from revolver borrowings	575,000	0
Repayments of revolver borrowings	325,000	0
Repayment of note payable	0	(1,200)
Proceeds from insurance premium financing	30,200	27,900
Net cash provided by financing activities	255,500	25,000
Net decrease in cash and cash equivalents	(177,100)	(210,400)
Cash and equivalents, beginning of period	561,700	526,200
Cash and equivalents, end of period	384,600	315,800
Non-cash activities:
Accrued and unpaid capital expenditures	118,100	129,000
Assets acquired under operating leases	936,600	0
Distribution of assets to parent company	300	0
Rail Term Loan [Member]
Cash flows from financing activities:
Repayments of Long-term Debt	$ (1,700)	$ (1,700)