Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income (loss)	$ 7,222	$ (983)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operations:
Depreciation and amortization	11,271	9,387
Stock-based compensation expense	2,289	2,836
Provision for deferred income taxes	381	(2,545)
Net provision for doubtful accounts	341	666
Gain on sale of assets	(383)	(847)
Amortization of original issue discount and debt issuance costs	1,309	1,330
Change in assets and liabilities:
Increase in receivables	(5,928)	(23,019)
Increase in inventories	(17,841)	(829)
Decrease in other assets	129	521
Increase (decrease) in accounts payable	18,511	(1,692)
Increase (decrease) in accrued liabilities and other	(17,168)	3,731
Net cash provided by (used in) operating activities	133	(11,444)
Cash flows from investing activities:
Capital expenditures	(10,696)	(7,291)
Refund of proceeds from sale of a business	(13,974)	0
Proceeds from sale of property, plant and equipment	575	288
Net cash used in investing activities	(24,095)	(7,003)
Cash flows from financing activities:
Borrowings on lines of credit	107,156	0
Payments on lines of credit	(81,224)	0
Debt issuance costs	0	(157)
Proceeds from employee stock plans	353	211
Purchases of treasury stock	(42)	(48)
Other financing activities	(545)	(371)
Net cash provided by (used in) financing activities	25,698	(365)
Effect of exchange rate changes on cash	812	846
Net increase (decrease) in cash, cash equivalents, and restricted cash	2,548	(17,966)
Cash, cash equivalents, and restricted cash at beginning of period	65,460	95,299
Cash, cash equivalents, and restricted cash at end of period	$ 68,008	$ 77,333