Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net loss	$ (27,395)	$ (49,130)	$ (13,462)
Loss from discontinued operations, net of tax	(14,342)	(51,037)	(20,620)
(Loss) income from continuing operations	(13,053)	1,907	7,158
Adjustments to reconcile (loss) income from continuing operations to net cash provided by operating activities:
Depreciation and amortization	12,159	10,429	8,735
Amortization of deferred financing costs	472	424	346
Provision for doubtful accounts	113	558	367
Loss (gain) on sale of assets	292	(18)	(12)
Stock compensation expense	11,172	12,053	13,083
Deferred income tax provision (benefit)	181	(19,681)	(7,929)
Reduction in (excess) tax benefit related to share-based awards	1,989	2,510	(1,273)
Changes in current assets and liabilities:
Accounts receivable, net	1,456	(11,544)	13,676
Inventories	(17,291)	(6,528)	(9,905)
Income taxes receivable	8,008	(8,189)	(4,700)
Other current assets	12,153	(14,489)	167
Accounts payable	(8,719)	12,653	(7,653)
Accrued liabilities	8,180	23,946	9,552
Income taxes payable	0	(1,890)	3,842
Interest payable	19	(87)	18
Net cash provided by operating activities	17,131	2,054	25,472
Cash flows from investing activities:
Capital expenditures	(8,960)	(13,960)	(16,391)
Proceeds from sale of businesses	18,490	0	0
Proceeds from sale of assets	689	115	13
Payments for acquisitions, net of cash acquired	0	(7,863)	0
Purchase of patents and other intangible assets	(479)	(573)	(627)
Net cash provided by (used in) investing activities	9,740	(22,281)	(17,005)
Cash flows from financing activities:
Repayments of indebtedness	(9,833)	(15,564)	(10,143)
Borrowings on revolving credit facility	383,160	338,460	382,666
Repayments on revolving credit facility	(393,776)	(325,043)	(366,018)
Debt issuance costs	(579)	(1,199)	(10)
(Reduction in) excess tax benefit related to share-based awards	0	(2,510)	1,273
Purchase of treasury stock	(1,729)	(2,350)	(6,345)
Proceeds from sale of common stock	654	30,923	879
Repurchase of common stock	(5,203)	0	(9,697)
Proceeds from exercise of stock options	21	134	39
Proceeds from noncontrolling interest	0	0	7
Net cash (used in) provided by financing activities	(27,285)	22,851	(7,349)
Discontinued operations:
Net cash (used in) provided by operating activities	(684)	12	1,199
Net cash provided by (used in) investing activities	708	(18)	(1,199)
Net cash flows provided by (used in) discontinued operations	24	(6)	0
Effect of changes in exchange rates on cash and cash equivalents	151	(3)	(176)
Net (decrease) increase in cash and cash equivalents	(239)	2,615	942
Cash and cash equivalents at beginning of year	4,823	2,208	1,266
Cash and cash equivalents at end of year	$ 4,584	$ 4,823	$ 2,208