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STATEMENTS OF CONSOLIDATED CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
OPERATING ACTIVITIES    
Net income $ 11,351 $ 14,729
Adjustments to reconcile net income to net cash provided by (used in) operations:    
Depreciation and amortization 6,084 5,423
Provision for accounts receivable allowances 380 652
Provision for inventory reserves 482 1,155
Deferred income taxes (480) (642)
Share-based compensation expense 1,310 1,334
Excess tax benefits from share-based awards (155) 0
Loss (gain) on sale of property and equipment 18 (135)
Other-net (7) (14)
Changes in operating assets and liabilities:    
Accounts receivable (9,477) (4,998)
Inventories 4,945 (2,037)
Trade accounts payables and accrued liabilities 4,577 8,604
Income taxes payable (4,510) (535)
Other-net (2,112) (1,089)
NET CASH PROVIDED BY OPERATING ACTIVITIES 12,406 22,447
INVESTING ACTIVITIES    
Capital expenditures (10,789) (12,893)
Business acquisitions, net of cash acquired 0 (5,173)
Proceeds from the sale of property and equipment 47 1,902
NET CASH USED IN INVESTING ACTIVITIES (10,742) (16,164)
FINANCING ACTIVITIES    
Decrease in notes payable to banks (218) (1,754)
Proceeds from the issuance of long-term debt 33,643 37,642
Payments of long-term debt (30,417) (40,296)
Dividends paid (98) (2,200)
Excess tax benefits from share-based awards 155 0
Earn-out consideration payment (538) (1,148)
Proceeds from issuance of common shares 895 145
Purchase of common shares for treasury (2,892) (195)
NET CASH PROVIDED BY (USED IN)FINANCING ACTIVITIES 530 (7,806)
Effects of exchange rate changes on cash and cash equivalents 884 (205)
Net increase (decrease) in cash and cash equivalents 3,078 (1,728)
Cash and cash equivalents at beginning of year 28,120 32,126
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 31,198 $ 30,398