CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities
Net loss	$ (22,272)	$ (32,444)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	9,194	12,430
Provision for doubtful accounts	42	238
Deferred income taxes	4	1,302
Gain on disposal or impairment of assets	(4)	0
Foreign currency transaction loss, net	0	5
Stock compensation expense	891	1,348
Change in fair value of derivative instruments	(604)	385
Changes in operating assets and liabilities:
Trade accounts and other receivables	2,200	(5,794)
Inventories	4,975	5,455
Prepaid expenses and other current assets	(1,404)	(650)
Accounts payable	1,053	(1,475)
Accrued expenses	(2,578)	785
Income tax receivable, net	40	(1,377)
Other, net	1,380	721
Net cash used in operating activities	(7,083)	(19,071)
Investing activities
Capital expenditures	(372)	(634)
Net cash used in investing activities	(372)	(634)
Financing activities
Repayments on long-term debt	0	(3,250)
Repayments on insurance financing agreement	(375)	(462)
Payments of debt issuance costs	0	(875)
Purchase of common stock	(421)	(518)
Net cash used in financing activities	(796)	(5,105)
Effect of exchange rate changes on cash	0	513
Net decrease in cash and cash equivalents and restricted cash	(8,251)	(24,297)
Cash and cash equivalents and restricted cash at beginning of period	78,385	91,680
Cash and cash equivalents and restricted cash at end of period	70,134	67,383
Supplemental cash flow information
Interest paid	2,906	761
Income taxes paid	$ 0	$ 0