Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 1,282	$ 7,222
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	11,438	11,271
Stock-based compensation expense	4,969	2,289
Provision for deferred income taxes	(438)	381
Net provision for doubtful accounts	386	341
Gain on sale of assets	(2,339)	(383)
Amortization of original issue discount and debt issuance costs	1,481	1,309
Change in assets and liabilities:
(Increase) decrease in receivables	5,300	(5,928)
(Increase) decrease in inventories	10,139	(17,841)
(Increase) decrease in other assets	(273)	129
Increase (decrease) in accounts payable	(15,149)	18,511
Decrease in accrued liabilities and other	(14,527)	(17,168)
Net cash provided by operating activities	2,269	133
Cash flows from investing activities:
Capital expenditures	(17,467)	(10,696)
Proceeds from sale of property, plant and equipment	1,771	575
Refund of proceeds from sale of a business	0	(13,974)
Net cash used in investing activities	(15,696)	(24,095)
Cash flows from financing activities:
Borrowings on lines of credit	80,656	107,156
Payments on lines of credit	(61,524)	(81,224)
Debt issuance costs	(927)	0
Proceeds from employee stock plans	330	353
Purchases of treasury stock	(5,013)	(42)
Other financing activities	(1,169)	(545)
Net cash provided by financing activities	12,353	25,698
Effect of exchange rate changes on cash	(581)	812
Net increase (decrease) in cash, cash equivalents, and restricted cash	(1,655)	2,548
Cash, cash equivalents, and restricted cash at beginning of period	64,266	65,460
Cash, cash equivalents, and restricted cash at end of period	$ 62,611	$ 68,008