CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Cash flows from operating activities:
Net Income (Loss)	$ (222,337)	$ 61,092
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities:
Depreciation, depletion, and amortization	21,283	20,957
Impairment expense	67,922	0
Debt extinguishment and commitment costs	0	5,496
Non-cash interest expense	1,634	2,574
Non-cash lower of cost or net realizable value adjustment	182,366	(3,752)
Change in value of common stock warrants	(4,270)	1,282
Deferred taxes	(18,373)	(65,129)
Stock-based compensation	1,615	1,535
Unrealized loss on derivative contracts	28,351	5,255
Equity (earnings) losses from Laramie Energy, LLC	45,031	(301)
Net changes in operating assets and liabilities:
Trade accounts receivable	30,989	(71,361)
Prepaid and other assets	20,719	(58,309)
Inventories	119,888	(76,766)
Deferred turnaround expenditures	(1,593)	0
Obligations under inventory financing agreements	(204,375)	82,870
Accounts payable, other accrued liabilities, and operating lease ROU assets and liabilities	(54,351)	37,799
Net cash provided by (used in) operating activities	14,499	(56,758)
Cash flows from investing activities:
Acquisitions of businesses, net of cash acquired	0	(274,291)
Proceeds from purchase price settlement related to asset acquisition	0	3,226
Capital expenditures	(14,948)	(17,864)
Other investing activities	5	188
Net cash used in investing activities	(14,943)	(288,741)
Cash flows from financing activities:
Proceeds from borrowings	55,000	383,006
Repayments of borrowings	(64,762)	(89,038)
Net borrowings (repayments) on deferred payment arrangements and receivable advances	(52,069)	56,967
Payment of deferred loan costs	0	(13,293)
Payments for debt extinguishment and commitment costs	0	(6,188)
Other financing activities, net	(1,660)	(734)
Net cash provided by (used in) financing activities	(63,491)	330,720
Net decrease in cash, cash equivalents, and restricted cash	(63,935)	(14,779)
Cash, cash equivalents, and restricted cash at beginning of period	128,428	75,819	$ 75,819
Cash, cash equivalents, and restricted cash at end of period	64,493	61,040	128,428
Net cash received (paid) for:
Interest	(8,552)	(3,389)
Taxes	97	0
Non-cash investing and financing activities:
Accrued capital expenditures	7,301	9,457
Value of warrants reclassified to equity	3,936		$ 0
ROU assets obtained in exchange for new finance lease liabilities	1,590	0
ROU assets obtained in exchange for new operating lease liabilities	2,996	14,130
ROU assets terminated in exchange for release from operating lease liabilities	7,738	0
Common stock issued for business combination	$ 0	$ 36,980