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Statements of Consolidated Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
OPERATING ACTIVITIES    
Net income $ 14,729 $ 15,384
Adjustments to reconcile net income to net cash provided by (used in) operations:    
Depreciation and amortization 5,423 5,076
Provision for accounts receivable allowances 652 631
Provision for inventory reserves 1,155 814
Deferred income taxes (642) (690)
Share-based compensation expense 1,334 1,458
Excess tax benefits from share-based awards 0 (190)
Loss (Gain) on sale of property and equipment (135) 58
Other - net (14) (19)
Changes in operating assets and liabilities:    
Accounts receivable (4,998) (17,475)
Inventories (2,037) (9,689)
Trade accounts payables and accrued liabilities 8,604 7,518
Income taxes payable (535) 2,755
Other - net (1,089) (3,497)
NET CASH PROVIDED BY OPERATING ACTIVITIES 22,447 2,134
INVESTING ACTIVITIES    
Capital expenditures (12,893) (6,504)
Business acquisitions, net of cash acquired (5,173) 0
Proceeds from the sale of property and equipment 1,902 168
Restricted cash 0 (330)
NET CASH USED IN INVESTING ACTIVITIES (16,164) (6,666)
FINANCING ACTIVITIES    
Increase (decrease) in notes payable to banks (4,102) 9,990
Payments of long-term debt (306) (924)
Dividends paid (2,200) (2,189)
Excess tax benefits from share-based awards 0 190
Earn-out consideration payment (1,148) 0
Proceeds from issuance of common shares 145 958
Purchase of common shares for treasury (195) (2,518)
NET CASH PROVIDED BY FINANCING ACTIVITIES (7,806) 5,507
Effects of exchange rate changes on cash and cash equivalents (205) (13)
Net increase (decrease) in cash and cash equivalents (1,728) 962
Cash and cash equivalents at beginning of year 32,126 22,655
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 30,398 $ 23,617