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Statements of Consolidated Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
OPERATING ACTIVITIES    
Net income $ 4,965 $ 8,133
Adjustments to reconcile net income to net cash provided by (used in) operations:    
Depreciation and amortization 2,961 2,684
Provision for accounts receivable allowances 95 172
Provision for inventory reserves 165 944
Deferred income taxes (321) 1,550
Share-based compensation expense 423 498
Other - net (1) (9)
Changes in operating assets and liabilities:    
Accounts receivable (5,616) (3,778)
Inventories 241 (724)
Trade accounts payables and accrued liabilities 206 917
Income taxes payable (2,786) (1,644)
Other - net (1,728) (549)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES (1,396) 8,194
INVESTING ACTIVITIES    
Capital expenditures (5,883) (9,442)
Business acquisitions, net of cash acquired 0 (6,176)
Proceeds from the sale of property and equipment 36 3
NET CASH USED IN INVESTING ACTIVITIES (5,847) (15,615)
FINANCING ACTIVITIES    
Decrease in notes payable to banks (123) (607)
Proceeds from the issuance of long- term debt 18,532 24,996
Payments of long-term debt (11,847) (19,384)
Earn-out consideration payments (112) 0
Dividends paid 0 (1,095)
Proceeds from issuance of common shares 20 24
Purchase of common shares for treasury (134) (93)
NET CASH PROVIDED BY FINANCING ACTIVITIES 6,336 3,841
Effects of exchange rate changes on cash and cash equivalents (189) 640
Net increase (decrease) in cash and cash equivalents (1,096) (2,940)
Cash and cash equivalents at beginning of year 28,120 32,126
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 27,024 $ 29,186