Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ 32,281	$ (6,148)	$ (40,712)
Adjustments to reconcile net income to net cash provided by operations:
Impairments and other non-cash charges	0	0	12,523
Depreciation and amortization	45,899	39,757	37,955
Stock-based compensation expense	10,361	10,843	12,056
Provision for deferred income taxes	236	(10,350)	3,352
Net provision for doubtful accounts	2,849	1,481	2,416
Loss on sale of a business	0	21,983	0
Gain on sale of assets	(1,821)	(5,478)	(2,820)
Gain on extinguishment of debt	0	0	(1,615)
Gain on insurance recovery	(606)	0	0
Amortization of original issue discount and debt issuance costs	5,510	5,345	1,618
Change in assets and liabilities:
Increase in receivables	(7,388)	(73,722)	(1,699)
(Increase) decrease in inventories	(30,352)	(15,097)	16,044
Decrease in other assets	1,055	986	1,708
Increase (decrease) in accounts payable	2,449	14,153	(5,213)
Increase (decrease) in accrued liabilities and other	2,930	54,628	(24,518)
Net cash provided by operating activities	63,403	38,381	11,095
Cash flows from investing activities:
Capital expenditures	(45,141)	(31,371)	(38,440)
Refund of proceeds from sale of a business	(13,974)	0	0
Proceeds from sale of property, plant and equipment	2,612	7,747	4,540
Proceeds from insurance property claim	1,000	0	0
Business acquisitions, net of cash acquired	(249)	(44,750)	(4,420)
Net cash used in investing activities	(55,752)	(68,374)	(38,320)
Cash flows from financing activities:
Borrowings on lines of credit	347,613	176,267	6,437
Payments on lines of credit	(352,582)	(93,700)	(14,269)
Proceeds from 2021 Convertible Notes	0	0	100,000
Purchases of 2017 Convertible Notes	0	0	(87,271)
Payment on 2017 Convertible Notes	0	(83,252)	0
Debt issuance costs	(149)	(955)	(5,403)
Proceeds from employee stock plans	3,874	2,424	725
Purchases of treasury stock	(3,870)	(3,239)	(1,226)
Other financing activities	601	165	357
Net cash used in financing activities	(4,513)	(2,290)	(650)
Effect of exchange rate changes on cash	(4,332)	2,444	(1,449)
Net decrease in cash, cash equivalents, and restricted cash	(1,194)	(29,839)	(29,324)
Cash, cash equivalents, and restricted cash at beginning of year	65,460	95,299	124,623
Cash, cash equivalents, and restricted cash at end of year	$ 64,266	$ 65,460	$ 95,299

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Amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments.

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The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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Amount of cash inflow (outflow) from financing activities classified as other.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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