Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities
Net income	$ 41,151us-gaap_NetIncomeLoss	$ 36,094us-gaap_NetIncomeLoss	$ 28,903us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash provided by operating activities:
Provision for doubtful accounts	469us-gaap_ProvisionForDoubtfulAccounts	31us-gaap_ProvisionForDoubtfulAccounts	253us-gaap_ProvisionForDoubtfulAccounts
Depreciation	10,645us-gaap_Depreciation	8,898us-gaap_Depreciation	9,948us-gaap_Depreciation
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Amortization of debt issuance	183us-gaap_AmortizationOfFinancingCosts	126us-gaap_AmortizationOfFinancingCosts	126us-gaap_AmortizationOfFinancingCosts
Goodwill impairment	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	656us-gaap_GoodwillImpairmentLoss
Stock-based compensation	1,986us-gaap_ShareBasedCompensation	1,501us-gaap_ShareBasedCompensation	940us-gaap_ShareBasedCompensation
Excess tax expense (benefit) from stock-based payment arrangements	(94)	0	102
Provision for deferred income tax (benefit) expense	(108)us-gaap_DeferredIncomeTaxExpenseBenefit	(877)us-gaap_DeferredIncomeTaxExpenseBenefit	(405)us-gaap_DeferredIncomeTaxExpenseBenefit
(Gain) Loss on sale of property, plant and equipment	(911)	(237)	155
Changes in operating assets and liabilities, net of effect of acquisitions:
Accounts receivable	(12,596)	(10,515)	4,770
Inventories	(10,993)us-gaap_IncreaseDecreaseInInventories	776us-gaap_IncreaseDecreaseInInventories	6,932us-gaap_IncreaseDecreaseInInventories
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Prepaid expenses and other	6,661	(925)	(2,376)
Trade accounts payable and accrued liabilities	1,202	4,420	960
Income taxes payable	(3,075)	(4,565)	2,338
Other assets and liabilities, net	(1,131)	(3,100)	(2,039)
Net cash provided by operating activities	30,210	31,627	51,263
Investing Activities
Acquisitions, net of cash acquired	(196,467)	(1,002)	0
Purchase of property, plant and equipment	(9,806)	(13,639)	(4,654)
Proceeds from sale of property, plant and equipment	1,442	475	564
Net cash used in investing activities	(204,831)	(14,166)	(4,090)
Financing Activities
Borrowings on bank revolving credit facility	273,000	0	(7,000)
Repayment on bank revolving credit facility	(83,000)us-gaap_RepaymentsOfLinesOfCredit	0us-gaap_RepaymentsOfLinesOfCredit	0us-gaap_RepaymentsOfLinesOfCredit
Principal payments on long-term debt and capital leases	(682)	(399)	(2,117)
Proceeds from issuance of long-term debt	767	0	0
Debt issuance cost	(818)us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts
Dividends paid	(3,328)us-gaap_PaymentsOfDividendsCommonStock	(3,371)us-gaap_PaymentsOfDividendsCommonStock	(2,854)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from exercise of stock options	903	1,286	2,131
Treasury stock	(34,204)	0	0
Excess tax expense (benefit) from stock-based payment arrangements	94	0	(102)
Net cash provided by (used in) financing activities	152,732	(2,484)	(9,942)
Effect of exchange rate changes on cash	(2,538)	692	772
Net change in cash and cash equivalents	(24,427)	15,669	38,003
Cash and cash equivalents at beginning of the year	63,960	48,291	10,288
Cash and cash equivalents at end of the year	39,533	63,960	48,291
Cash paid during the year for:
Interest	3,320us-gaap_InterestPaidNet	1,118us-gaap_InterestPaidNet	1,837us-gaap_InterestPaidNet
Income taxes	$ 22,243us-gaap_IncomeTaxesPaidNet	$ 21,580us-gaap_IncomeTaxesPaidNet	$ 13,533us-gaap_IncomeTaxesPaidNet

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

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-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The net cash inflow or cash outflow 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 either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

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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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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

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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.

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