CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating activities
Net loss	$ (20,783,000)	$ (29,149,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	25,966,000	32,231,000
Stock-based compensation expense	9,950,000	10,477,000
Impairment and other charges	0	60,968,000
Gain on sale of assets	(5,113,000)	(79,000)
Deferred income taxes	(914,000)	(31,529,000)
Changes in operating assets and liabilities:
Trade receivables, net	298,000	21,271,000
Inventories, net	32,610,000	32,596,000
Prepaids and other assets	(9,675,000)	17,308,000
Accounts payable and accrued expenses	(41,000)	(39,359,000)
Other, net	309,000	0
Net cash provided by operating activities	32,607,000	74,735,000
Investing activities
Purchase of property, plant and equipment	(26,683,000)	(19,563,000)
Proceeds from sale of equipment	11,244,000	1,160,000
Acquisition of business, net of cash acquired	0	(21,289,000)
Net cash used in investing activities	(15,439,000)	(39,692,000)
Financing activities
Repurchase of common shares	(80,937,000)	0
ABL Credit Facility issuance costs	(815,000)	0
Proceeds from exercise of stock options	1,106,000	455,000
Net cash provided by (used in) financing activities	(80,646,000)	455,000
Effect of exchange rate changes on cash activities	(5,649,000)	14,050,000
Increase (decrease) in cash and cash equivalents	(69,127,000)	49,548,000
Cash and cash equivalents at beginning of period	493,180,000	423,497,000
Cash and cash equivalents at end of period	$ 424,053,000	$ 473,045,000