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Condensed Consolidated Statements of Cash Flows (unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net earnings $ 19,240 $ 18,484
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation and amortization 4,806 4,492
Stock compensation expense 1,946 1,934
Shares issued under employee benefit plans 310 293
Deferred income tax expense (828) (976)
Foreign currency transaction loss 68 92
Loss on impairment of assets 0 94
Changes in assets and liabilities    
Accounts receivable (2,784) (5,783)
Inventories (1,537) (2,973)
Prepaid expenses and other current assets 515 955
Accounts payable and accrued expenses 2,632 641
Income taxes 6,753 (354)
Other 102 218
Net cash provided by operating activities 31,223 17,117
Cash flows from investing activities:    
Capital expenditures (3,198) (3,210)
Proceeds from sale of property, plant and equipment 0 28
Intangible assets acquired (10) (3)
Net cash used in investing activities (3,208) (3,185)
Cash flows from financing activities:    
Proceeds from long-term debt 178 0
Principal payments on long-term debt (695) (790)
Proceeds from stock options exercised and restricted shares purchased 877 2,314
Excess tax benefits from stock compensation 1,182 1,282
Dividends paid (5,237) (4,310)
Purchase of treasury stock (964) (108)
Net cash used in financing activities (4,659) (1,612)
Effect of exchange rate changes on cash (77) 169
Increase in cash and cash equivalents 23,279 12,489
Cash and cash equivalents beginning of period 114,781 77,253
Cash and cash equivalents end of period $ 138,060 $ 89,742