CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net loss	$ (34,969)	$ (50,027)	$ (72,788)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	79,839	71,575	73,986
Amortization of deferred financing costs and original issue discount	3,666	3,333	3,046
Loss on asset disposals	3,397	390	70
Share-based compensation	3,445	3,017	3,021
Other adjustments	(5)	1,690	2,425
Changes in assets and liabilities:
Accounts receivable	936	(6,698)	4,087
Inventories	9,914	(8,670)	59
Prepaid expenses and other current assets	1,582	(1,196)	1,052
Accounts payable	(8,077)	5,215	(2,315)
Deferred revenue	(14,575)	10,828	904
Accrued expenses and other current liabilities	(6,542)	1,367	(4,969)
Other long-term assets and liabilities	546	1,410	1,822
Net cash provided by operating activities	39,157	32,234	10,400
Cash flows from investing activities:
Capital expenditures	(18,656)	(19,806)	(14,556)
Proceeds from the sale of assets	127	175	0
Net cash used in investing activities	(18,529)	(19,631)	(14,556)
Cash flows from financing activities:
Cash distributions to common unitholders – Affiliates	(15,568)	0	(778)
Cash distribution to common unitholders – Non-affiliates	(29,745)	0	(1,488)
Other financing activities	(97)	0	0
Net cash used in financing activities	(45,410)	0	(2,266)
Net (decrease) increase in cash and cash equivalents	(24,782)	12,603	(6,422)
Cash and cash equivalents, beginning of period	61,776	49,173	55,595
Cash and cash equivalents, end of period	$ 36,994	$ 61,776	$ 49,173