Unaudited Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income (loss)	$ (1,515)us-gaap_NetIncomeLoss	$ 12,018us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	4,570	4,219
Amortization of deferred financing costs	86us-gaap_AmortizationOfFinancingCosts	106us-gaap_AmortizationOfFinancingCosts
Gain on sale of assets	(1,223)	(558)
Stock compensation expense	3,462us-gaap_ShareBasedCompensation	2,334us-gaap_ShareBasedCompensation
Deferred income tax benefit	(2,367)us-gaap_DeferredIncomeTaxExpenseBenefit	(290)us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax benefit related to share-based awards	(87)	(1,300)
Changes in current assets and liabilities, net of acquisitions:
Accounts receivable, net	22,613	(525)
Inventories	(11,990)us-gaap_IncreaseDecreaseInInventories	(9,863)us-gaap_IncreaseDecreaseInInventories
Other current assets	1,782	885
Accounts payable	(4,758)	6,700
Accrued liabilities	(4,663)	(2,531)
Income taxes payable	535	4,322
Interest payable	13	(12)
Net cash provided by operating activities	6,458	15,505
Cash flows from investing activities:
Capital expenditures	(5,590)	(4,115)
Proceeds from sale of assets	1,315	832
Payments for acquisitions, net of cash acquired	(1,250)	(5,286)
Purchase of patents and other intangible assets	(115)	(135)
Net cash used in investing activities	(5,640)	(8,704)
Cash flows from financing activities:
Repayments of indebtedness	(4,786)us-gaap_RepaymentsOfOtherLongTermDebt	(4,786)us-gaap_RepaymentsOfOtherLongTermDebt
Borrowings on revolving credit facility	112,151	96,750
Repayments on revolving credit facility	(103,376)	(99,097)
Debt issuance costs	0us-gaap_PaymentsOfDebtIssuanceCosts	(59)us-gaap_PaymentsOfDebtIssuanceCosts
Excess tax benefit related to share-based awards	87	1,300
Purchase of treasury stock related to share-based awards	(1,055)	(4,045)
Proceeds from sale of common stock	256	231
Repurchase of common stock	(2,651)	0
Proceeds from exercise of stock options	22	443
Proceeds from exercise of stock warrants	0us-gaap_ProceedsFromWarrantExercises	1,545us-gaap_ProceedsFromWarrantExercises
Proceeds from noncontrolling interest	7	0
Net cash provided by (used in) financing activities	655	(7,718)
Effect of changes in exchange rates on cash and cash equivalents	(240)	(149)
Net increase (decrease) in cash and cash equivalents	1,233	(1,066)
Cash and cash equivalents at the beginning of period	1,266	2,730
Cash and cash equivalents at the end of period	$ 2,499	$ 1,664

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromStockOptionsExercised
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromWarrantExercises
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

Name:	us-gaap_RepaymentsOfLongTermLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow attributable to repayments of borrowings not otherwise defined in the taxonomy (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

+ Details

Name:	us-gaap_RepaymentsOfOtherLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration