Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities
Net income	$ 63,531	$ 50,971	$ 41,918
Adjustments to reconcile net income to net cash provided by operating activities:
Loss (gain) on sale of assets	(325)	2,038	166
Depreciation and amortization	27,918	27,518	26,857
Impairment of long-lived assets	0	1,025	803
Impairment of goodwill	530us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	2,346us-gaap_GoodwillImpairmentLoss
Gain on contingent consideration adjustment	(545)	0	0
Deferred income taxes	2,181us-gaap_DeferredIncomeTaxExpenseBenefit	3,620us-gaap_DeferredIncomeTaxExpenseBenefit	189us-gaap_DeferredIncomeTaxExpenseBenefit
Noncash compensation related to stock plans	13,190us-gaap_ShareBasedCompensation	12,747us-gaap_ShareBasedCompensation	10,667us-gaap_ShareBasedCompensation
Excess tax benefit of options exercised	(79)	(80)	(110)
Provision for (recovery of) doubtful accounts	151us-gaap_ProvisionForDoubtfulAccounts	(48)us-gaap_ProvisionForDoubtfulAccounts	355us-gaap_ProvisionForDoubtfulAccounts
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions:
Trade accounts receivable	(4,568)	(6,651)	(2,678)
Inventories	(22,428)us-gaap_IncreaseDecreaseInInventories	8,458us-gaap_IncreaseDecreaseInInventories	(17,045)us-gaap_IncreaseDecreaseInInventories
Other current assets	(3,683)	27	3,970
Other noncurrent assets	(600)	237	(244)
Trade accounts payable	(11,266)	(2,708)	12,208
Accrued liabilities	2,270	2,653	(909)
Accrued profit sharing trust contributions	(382)	617	703
Accrued cash profit sharing and commissions	81	2,611	(54)
Other long-term liabilities	2,607	(1,024)	(1,433)
Accrued workers' compensation	(490)	(100)	(783)
Income taxes payable	(872)	4,595	(8,874)
Net cash provided by operating activities	67,221	106,506	68,052
Cash flows from investing activities
Capital expenditures	(23,715)	(16,804)	(21,961)
Business acquisitions, net of cash acquired	(220)	(6,493)	(65,125)
Loan made to customer	(281)	0	0
Loan repayment by customer	39	0	0
Loan repayments by related parties	0	700	1,698
Proceeds from sale of assets and a business	672	5,262	7,642
Net cash used in investing activities	(23,505)	(17,335)	(77,746)
Cash flows from financing activities
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Debt issuance costs	0us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts	(1,415)us-gaap_PaymentsOfDebtIssuanceCosts
Contingent consideration of asset acquisitions	(1,293)	(520)	(354)
Repurchase of common stock	(2,981)	(9,825)	0
Issuance of Company's common stock	4,582	15,057	4,925
Excess tax benefit of options exercised	79	80	110
Dividends paid	(25,918)us-gaap_PaymentsOfDividendsCommonStock	(18,130)us-gaap_PaymentsOfDividendsCommonStock	(30,193)us-gaap_PaymentsOfDividendsCommonStock
Net cash used in financing activities	(25,608)	(13,419)	(30,491)
Effect of exchange rate changes on cash	(9,009)	(97)	1,921
Net increase (decrease) in cash and cash equivalents	9,099	75,655	(38,264)
Cash and cash equivalents at beginning of year	251,208	175,553	213,817
Cash and cash equivalents at end of year	260,307	251,208	175,553
Cash paid during the year for
Interest	117us-gaap_InterestPaidNet	30us-gaap_InterestPaidNet	350us-gaap_InterestPaidNet
Income taxes	34,977us-gaap_IncomeTaxesPaid	23,624us-gaap_IncomeTaxesPaid	31,391us-gaap_IncomeTaxesPaid
Noncash activity during the year for
Capital expenditures	1,031	1,082	974
Asset acquisition	0us-gaap_FairValueOfAssetsAcquired	806us-gaap_FairValueOfAssetsAcquired	786us-gaap_FairValueOfAssetsAcquired
Stock-based compensation	402	318	418
Dividends declared but not paid	6,843	6,095	6,053
Contribution in excess of pension benefit cost	$ 39	$ 55	$ 57

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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