CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating activities
Net loss	$ (5,679)	$ (20,783)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	25,155	25,966
Release of contingent consideration	(2,001)	0
Stock-based compensation expense	15,746	9,950
Restructuring and other charges	162	0
Gain on sale of assets	(1,483)	(5,113)
Deferred income taxes	(534)	(914)
Changes in operating assets and liabilities:
Trade receivables, net	(35,466)	298
Inventories, net	(15,624)	32,610
Prepaids and other assets	12,744	(9,675)
Accounts payable and accrued expenses	13,667	(41)
Other, net	(63)	309
Net cash provided by operating activities	6,624	32,607
Investing activities
Purchase of property, plant and equipment	(8,620)	(26,683)
Proceeds from sale of equipment	2,401	11,244
Net cash used in investing activities	(6,219)	(15,439)
Financing activities
Repurchase of common shares	(5,365)	(80,937)
ABL Credit Facility issuance costs		(815)
Proceeds from exercise of stock options	2,327	1,106
Other	(239)
Net cash used in financing activities	(3,277)	(80,646)
Effect of exchange rate changes on cash activities	(2,126)	(5,649)
Increase in cash and cash equivalents	(4,998)	(69,127)
Cash and cash equivalents at beginning of period	418,100	493,180
Cash and cash equivalents at end of period	$ 413,102	$ 424,053