Condensed Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net earnings	$ 18,484	$ 15,368
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	4,492	4,144
Stock compensation expense	1,934	1,952
Shares issued under employee benefit plans	293	273
Deferred income tax expense	(976)	(1,010)
(Recovery of) provision for doubtful accounts	(7)	(176)
Foreign currency transaction (gain) loss	92	(54)
Loss on impairment of assets	94	0
Changes in assets and liabilities
Accounts receivable	(5,783)	(1,729)
Inventories	(2,973)	(3,261)
Prepaid expenses and other current assets	955	916
Accounts payable and accrued expenses	641	(474)
Income taxes	(354)	(649)
Customer deposits and other deferred revenue	(2)	39
Other	227	208
Net cash provided by operating activities	17,117	15,547
Cash flows from investing activities:
Capital expenditures	(3,210)	(4,469)
Proceeds from sale of property, plant and equipment	28	0
Acquisition of a business	0	(4,633)
Intangible assets acquired	(3)	0
Net cash used in investing activities	(3,185)	(9,102)
Cash flows from financing activities:
Principal payments on long-term debt	(790)	(713)
Proceeds from stock options exercised and restricted shares purchased	2,314	1,036
Excess tax benefits from stock compensation	1,282	726
Dividends paid	(4,310)	(3,091)
Purchase of treasury stock	(108)	0
Net cash used in financing activities	(1,612)	(2,042)
Effect of exchange rate changes on cash	169	(461)
Increase in cash and cash equivalents	12,489	3,942
Cash and cash equivalents beginning of year	77,253	46,432
Cash and cash equivalents end of year	$ 89,742	$ 50,374