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Statements of Consolidated Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
OPERATING ACTIVITIES      
Net income $ 29,286 $ 30,984 $ 23,008
Adjustments to reconcile net income to net cash provided by operations:      
Depreciation and amortization 11,564 10,525 9,394
Provision for accounts receivable allowances 1,416 1,292 661
Provision for inventory reserves 1,981 1,480 767
Deferred income taxes (2,927) (688) (900)
Share-based compensation expense 3,080 2,933 2,966
Excess tax benefits from share-based awards (197) (203) (73)
Net investment in life insurance (3) (28) (74)
Other - net (137) 73 (301)
Changes in operating assets and liabilities:      
Accounts receivable 5,047 (16,061) (4,977)
Inventories 1,290 (21,197) (8,268)
Trade accounts payables and accrued liabilities (3,196) 8,574 8,429
Income taxes payable 3,381 (815) 383
Other - net (200) 180 (2,327)
NET CASH PROVIDED BY OPERATING ACTIVITIES 50,385 17,049 28,688
INVESTING ACTIVITIES      
Capital expenditures (21,043) (18,912) (12,274)
Business acquisitions, net of cash acquired (5,173)   (14,324)
Proceeds from the sale of property and equipment 1,965 464 757
Restricted cash   (328)  
NET CASH USED IN INVESTING ACTIVITIES (24,251) (18,776) (25,841)
FINANCING ACTIVITIES      
Increase (decrease) in notes payable to banks (1,734) 1,015 (3,880)
Proceeds from the issuance of long-term debt 70,058 79,110 60,131
Payments of long-term debt (89,060) (61,065) (54,116)
Dividends paid (6,492) (4,381) (4,344)
Excess tax benefits from share-based awards 197 203 73
Earn-out consideration payment (1,148)    
Proceeds from issuance of common shares 549 1,064 285
Purchase of common shares for treasury (2,790) (3,522) (1,081)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES (30,420) 12,424 (2,932)
Effects of exchange rate changes on cash and cash equivalents 280 (1,226) (1,357)
Net increase (decrease) in cash and cash equivalents (4,006) 9,471 (1,442)
Cash and cash equivalents at beginning of year 32,126 22,655 24,097
CASH AND CASH EQUIVALENTS AT END OF YEAR $ 28,120 $ 32,126 $ 22,655