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 earnings	$ 9,095us-gaap_NetIncomeLoss	$ 15,908us-gaap_NetIncomeLoss	$ 2,373us-gaap_NetIncomeLoss
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	19,746	12,382	9,113
Stock-based compensation	2,717us-gaap_ShareBasedCompensation	1,879us-gaap_ShareBasedCompensation	1,767us-gaap_ShareBasedCompensation
Impairment/loss on disposal of assets related to restructuring	0	0	1,389
Impairment of investment	0	0	775
Amortization of deferred financing costs	699us-gaap_AmortizationOfFinancingCosts	0us-gaap_AmortizationOfFinancingCosts	0us-gaap_AmortizationOfFinancingCosts
Deferred income taxes	(2,562)us-gaap_DeferredIncomeTaxExpenseBenefit	(877)us-gaap_DeferredIncomeTaxExpenseBenefit	(1,234)us-gaap_DeferredIncomeTaxExpenseBenefit
Other, net	(3,651)us-gaap_OtherNoncashIncomeExpense	407us-gaap_OtherNoncashIncomeExpense	422us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:
Accounts receivable	1,382	(8,025)	260
Inventories	9,121us-gaap_IncreaseDecreaseInInventories	(6,538)us-gaap_IncreaseDecreaseInInventories	(343)us-gaap_IncreaseDecreaseInInventories
Other current assets	693	1,702	(273)
Other assets	(450)	(62)	(230)
Accounts payable	(3,890)	1,485	(1,422)
Accrued expenses	(10,170)	(7,548)	553
Other liabilities	423	165	11
Accrued restructuring costs	0	(122)	122
Income taxes payable	(696)	(175)	(1,674)
Net cash provided by operating activities	22,457	10,581	11,609
Cash flows from investing activities:
Purchase of property, plant and equipment	(9,042)	(6,940)	(4,744)
Purchase of intangible asset	0	(1,336)	0
Purchase of marketable securities	(2,936)	0	(24)
Purchase of company-owned life insurance	(2,820)	(2,820)	0
Cash transferred from (to) restricted cash	0	12,993	0
Payments for acquisitions, net of cash acquired	(208,693)	(30,994)	(19,410)
Proceeds from cash surrender of COLI policies	5,756	0	0
Proceeds from sale of marketable securities	0	2,820	5,119
Proceeds from disposal/sale of property, plant and equipment	65	96	193
Net cash used in investing activities	(217,670)	(26,181)	(18,866)
Cash flows from financing activities:
Dividends paid to common shareholders	(3,160)us-gaap_PaymentsOfDividends	(3,111)us-gaap_PaymentsOfDividends	(3,225)us-gaap_PaymentsOfDividends
Deferred financing costs	(5,756)us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts
Borrowings under revolving credit line	23,000	12,000	0
Repayments under revolving credit line	(12,000)	0	0
Increase (reduction) in notes payable	(161)	506	(17)
Proceeds from long-term debt	215,000	0	0
Repayments of long-term debt	(5,375)us-gaap_RepaymentsOfLongTermDebt	0us-gaap_RepaymentsOfLongTermDebt	0us-gaap_RepaymentsOfLongTermDebt
Purchase and retirement of Class B common stock	0	(3,356)	(6,644)
Net cash provided by (used in) financing activities	211,548	6,039	(9,886)
Effect of exchange rate changes on cash	(1,320)	422	164
Net increase (decrease) in cash and cash equivalents	15,015	(9,139)	(16,979)
Cash and cash equivalents - beginning of year	62,123	71,262	88,241
Cash and cash equivalents - end of year	77,138	62,123	71,262
Cash paid (received) during the year for:
Income taxes, net of refunds received	4,686us-gaap_IncomeTaxesPaidNet	(474)us-gaap_IncomeTaxesPaidNet	1,464us-gaap_IncomeTaxesPaidNet
Interest payments	3,210us-gaap_InterestPaid	156us-gaap_InterestPaid	16us-gaap_InterestPaid
Details of acquisition (see Note 2):
Fair value of identifiable net assets acquired	136,133	34,541	13,336
Goodwill	100,016us-gaap_GoodwillAcquiredDuringPeriod	4,812us-gaap_GoodwillAcquiredDuringPeriod	9,065us-gaap_GoodwillAcquiredDuringPeriod
Fair value of net assets acquired	236,149us-gaap_FairValueOfAssetsAcquired	39,353us-gaap_FairValueOfAssetsAcquired	22,401us-gaap_FairValueOfAssetsAcquired
Fair value of consideration transferred	236,149	39,353	22,401
Less: Cash acquired in acquisition	(27,456)us-gaap_CashAcquiredFromAcquisition	(8,359)us-gaap_CashAcquiredFromAcquisition	(2,991)us-gaap_CashAcquiredFromAcquisition
Cash paid for acquisition, net of cash acquired	$ 208,693	$ 30,994	$ 19,410

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