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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net earnings $ 41,353 $ 62,401 $ 21,960
Adjustments to reconcile net earnings to net cash provided by operating activities:      
Depreciation and amortization 16,466 14,145 13,574
Increase (decrease) to allowance for doubtful accounts (728) (484) 502
Increase to inventory reserves 4,921 4,504 7,403
Loss from sale of European distribution business 0 0 79
Amortization of deferred gain on sale of buildings (1,048) (1,048) (1,048)
Gain on disposal of property, plant and equipment (241) (35) (1,153)
Equity income from and gain on the sale of joint ventures 0 (2,826) (97)
Employee Stock Ownership Plan allocation 3,865 2,514 1,633
Stock-based compensation 2,358 2,025 1,494
Decrease in deferred income taxes 5,462 11,971 8,541
Decrease in unrecognized tax benefit 0 (454) (1,084)
Decrease in tax valuation allowance (669) (21,625) (353)
Loss on discontinued operations, net of tax 1,616 1,926 2,740
Change in assets and liabilities:      
Decrease in accounts receivable 15,393 9,595 19,336
Decrease (increase) in inventories (1,556) 2,500 (47,952)
Decrease (increase) in prepaid expenses and other current assets (659) 748 (702)
Increase (decrease) in accounts payable 3,287 (3,105) (1,542)
Increase in sundry payables and accrued expenses 6,837 4,026 7,975
Net changes in other assets and liabilities (3,097) (11,471) (3,228)
Net cash provided by operating activities 93,560 75,307 28,078
CASH FLOWS FROM INVESTING ACTIVITIES:      
Proceeds from the sale of property, plant and equipment 19 45 11
Net cash received from the sale of land and buildings 474 0 2,559
Divestiture of European distribution business 0 1,317 0
Divestiture of joint ventures 0 4,317 2,372
Capital expenditures (11,811) (11,037) (10,806)
Acquisitions of businesses and assets, net of cash acquired (38,594) (70,532) (2,024)
Net cash used in investing activities (49,912) (75,890) (7,888)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Net borrowings under (repayments of) line-of-credit agreements (32,547) 20,113 (5,543)
Purchase of treasury stock (4,999) (4,136) 0
Principal payments of long-term debt and capital lease obligations (105) (12,410) (5,421)
Increase (decrease) in overdraft balances 2,387 645 (2,920)
Proceeds from exercise of employee stock options 349 2,563 52
Excess tax benefits related to the exercise of employee stock grants 343 501 97
Adjustment to costs related to issuance of common stock 0 0 36
Payments of debt issuance costs 0 (329) (1,206)
Dividends paid (8,215) (6,381) (4,508)
Net cash provided by (used in) financing activities (42,787) 566 (19,413)
Effect of exchange rate changes on cash 1,342 (1,247) 740
Net increase (decrease) in cash and cash equivalents 2,203 (1,264) 1,517
CASH AND CASH EQUIVALENTS at beginning of year 10,871 12,135 10,618
CASH AND CASH EQUIVALENTS at end of year 13,074 10,871 12,135
Cash paid during the year for:      
Interest 1,636 2,775 5,387
Income taxes $ 16,087 $ 12,354 $ 2,173