CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net loss	$ (45,835)	$ (39,911)	$ (47,041)
Adjustments to reconcile net loss to cash provided by (used in) operating activities:
Depreciation, depletion and amortization	31,617	19,918	14,897
Impairment expense	0	9,639	0
Loss on termination of financing agreements	0	19,669	1,788
Gain on termination of other post-retirement benefits	0	(5,550)	0
Non-cash interest expense	18,121	12,449	13,470
Change in value of common stock warrants	(2,962)	3,664	(4,433)
Change in value of contingent consideration	(10,770)	18,450	(2,849)
Deferred taxes	(7,935)	(16,489)	(257)
Loss on sale of assets, net	0	0	624
Stock-based compensation	6,625	5,165	3,970
Unrealized loss (gain) on derivative contracts	(15,479)	10,896	(1,015)
Equity losses from Laramie Energy, LLC	22,381	55,983	(2,849)
Net changes in operating assets and liabilities:
Trade accounts receivable	(17,162)	54,529	5,608
Collateral posted with broker for derivative transactions	18,212	(20,927)	0
Prepaid and other assets	447	(35,697)	(5,966)
Inventories	49,015	31,913	61,529
Deferred turnaround expenditures	(32,661)	0	0
Obligations under inventory financing agreements	(5,977)	34,845	(112,884)
Accounts payable and other accrued liabilities	(26,698)	(26,188)	20,804
Contingent consideration	(4,830)	0	0
Net cash provided by (used in) operating activities	(23,891)	132,358	(54,604)
Cash flows from investing activities
Acquisitions of businesses, net of cash acquired	(209,183)	(64,331)	(10,582)
Capital expenditures	(24,833)	(22,345)	(14,300)
Proceeds from sale of assets	2,773	0	595
Investment in Laramie Energy, LLC	(55,000)	(27,529)	(12)
Net cash used in investing activities	(286,243)	(114,205)	(24,299)
Cash flows from financing activities
Proceeds from sale of common stock, net of offering costs	49,044	76,056	103,949
Proceeds from borrowings	354,682	208,158	363,620
Repayments of borrowings	(202,165)	(227,212)	(331,530)
Net borrowings (repayments) on deferred payment arrangement	8,027	(1,436)	0
Payment of deferred loan costs	(6,892)	(7,335)	(6,045)
Contingent consideration settlements	(11,980)	0	0
Proceeds from inventory financing agreements	0	271,000	0
Payments for termination of supply and exchange agreements	0	(257,811)	0
Other financing activities, net	(598)	(995)	58
Net cash provided by financing activities	190,118	60,425	130,052
Net increase (decrease) in cash and cash equivalents	(120,016)	78,578	51,149
Cash and cash equivalents at beginning of period	167,788	89,210	38,061
Cash and cash equivalents at end of period	47,772	167,788	89,210
Cash received (paid) for:
Interest	(13,217)	(6,891)	(4,526)
Taxes	589	402	243
Non-cash investing and financing activities:
Accrued capital expenditures	4,907	2,102	2,328
Stock issued used to settle bankruptcy claims	0	0	2,677
Value of warrants and debt reclassified to equity	3,084	7,691	786
Capital lease additions	$ 1,575	$ 216	$ 337