Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net (loss) income	$ (49,130)	$ (13,462)	$ 53,603
(Loss) income from discontinued operations, net of tax	(51,037)	(20,620)	13,981
Income from continuing operations	1,907	7,158	39,622
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Depreciation and amortization	10,429	8,735	7,713
Amortization of deferred financing costs	424	346	343
Provision for doubtful accounts	558	367	50
Provision for inventory reserves and market adjustments	0	0	10
Gain on sale of assets	(18)	(12)	60
Stock compensation expense	12,053	13,083	9,123
Deferred income tax (benefit) provision	(19,681)	(7,929)	1,502
Reduction in (excess) tax benefit related to share-based awards	2,510	(1,273)	(3,448)
Changes in current assets and liabilities:
Accounts receivable	(11,544)	13,676	(7,737)
Inventories	(6,528)	(9,905)	(14,067)
Income taxes receivable	(8,189)	(4,700)	0
Other current assets	(14,489)	167	(22,673)
Accounts payable	12,653	(7,653)	10,954
Accrued liabilities	23,946	9,552	19,824
Income taxes payable	(1,890)	3,842	1,386
Interest payable	(87)	18	(18)
Net cash provided by operating activities	2,054	25,472	42,644
Cash flows from investing activities:
Capital expenditures	(13,960)	(16,391)	(9,339)
Proceeds from sale of assets	115	13	59
Payments for acquisitions, net of cash acquired	(7,863)	0	(5,704)
Purchase of patents and other intangible assets	(573)	(627)	(676)
Net cash used in investing activities	(22,281)	(17,005)	(15,660)
Cash flows from financing activities:
Repayments of indebtedness	(15,564)	(10,143)	(10,292)
Borrowings on revolving credit facility	338,460	382,666	357,183
Repayments on revolving credit facility	(325,043)	(366,018)	(364,955)
Debt issuance costs	(1,199)	(10)	(399)
(Reduction in) excess tax benefit related to share-based awards	(2,510)	1,273	3,448
Purchase of treasury stock	(2,350)	(6,345)	(6,294)
Proceeds from sale of common stock	30,923	879	906
Repurchase of common stock	0	(9,697)	(10,395)
Proceeds from exercise of stock options	134	39	462
Proceeds from exercise of warrants	0	0	1,545
Proceeds from noncontrolling interest	0	7	351
Net cash provided by (used in) financing activities	22,851	(7,349)	(28,440)
Discontinued operations:
Net cash provided by operating activities	12	1,199	6,043
Net cash used in investing activities	(18)	(1,199)	(6,043)
Net cash flows used in discontinued operations	(6)	0	0
Effect of changes in exchange rates on cash and cash equivalents	(3)	(176)	(8)
Net increase (decrease) in cash and cash equivalents	2,615	942	(1,464)
Cash and cash equivalents at beginning of year	2,208	1,266	2,730
Cash and cash equivalents at end of year	$ 4,823	$ 2,208	$ 1,266