CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net loss	$ (50,027)	$ (72,788)	$ (26,938)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	71,575	73,986	58,246
Amortization of deferred financing costs and original issue discount	3,333	3,046	1,746
Amortization of debt fair value adjustment	0	0	1,250
Loss on asset disposals	390	70	220
Loss on debt extinguishment	0	0	4,862
Share-based compensation	3,017	3,021	2,786
Other adjustments	1,690	2,425	2,359
Changes in assets and liabilities:
Accounts receivable	(6,698)	4,087	2,185
Inventories	(8,670)	59	29,087
Prepaid expenses and other current assets	(1,200)	1,142	2,409
Other long-term assets	816	1,051	(1,383)
Accounts payable	5,215	(2,315)	5,795
Deferred revenue	10,828	904	(20,395)
Accrued expenses and other current liabilities	1,362	(4,969)	(17,519)
Other assets and liabilities	603	681	259
Net cash provided by operating activities	32,234	10,400	44,969
Cash flows from investing activities:
Capital expenditures	(19,806)	(14,556)	(23,231)
Acquisition of East Dubuque Facility, net of cash acquired	0	0	(63,869)
Other investing activity	175	0	0
Net cash used in investing activities	(19,631)	(14,556)	(87,100)
Cash flows from financing activities:
Principal payment on related party credit facility	0	0	(300,000)
Proceeds on related party credit facility	0	0	300,000
Payment of financing costs	0	0	(10,688)
Proceeds on issuance of 2023 Notes, net of original issue discount	0	0	628,869
Contribution from affiliate	0	0	507
Cash distributions to common unitholders – Affiliates	0	(778)	(27,633)
Cash distribution to common unitholders – Non-affiliates	0	(1,488)	(41,956)
Purchase of noncontrolling interest, net of issuance costs	0	0	(5,000)
Net cash provided by (used in) financing activities	0	(2,266)	47,759
Net increase (decrease) in cash and cash equivalents	12,603	(6,422)	5,628
Cash and cash equivalents, beginning of period	49,173	55,595	49,967
Cash and cash equivalents, end of period	61,776	49,173	55,595
2021 Notes
Cash flows from financing activities:
Principal and premium payments on long-term debt	0	0	(322,240)
CRNF Credit Facility
Cash flows from financing activities:
Principal and premium payments on long-term debt	0	0	(125,000)
Revolving credit facility
Cash flows from financing activities:
Principal and premium payments on long-term debt	$ 0	$ 0	$ (49,100)