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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 7,083 $ 13,566
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 4,453 4,245
(Benefit) provision for deferred income taxes (309) 105
Provision for returns and doubtful accounts 784 627
Compensation expense related to equity compensation plans 907 533
Excess tax benefit from exercises of stock options (420) (173)
Loss on dispositions and abandonment 28 27
Changes in operating assets and liabilities:    
Accounts receivable (7,928) 2,094
Inventories (12,892) (522)
Prepaid expenses and other current assets (2,435) 3,725
Accounts payable, accrued expenses and other current liabilities 25,505 (14,498)
Net cash provided by operating activities 14,776 9,729
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property, plant and equipment (1,970) (3,715)
Proceeds from disposals of property, plant and equipment 18 10
Net cash used in investing activities (1,952) (3,705)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings on credit facility and short term debt    25,466
Repayments of borrowings on credit facility and short term debt    (10,861)
Repayments of capital lease obligations (631) (654)
Proceeds from issuance of common stock 217 175
Excess tax benefit from exercises of stock options 420 173
Net cash provided by financing activities 6 14,299
Effects of exchange rates on cash 903 (116)
Net increase in cash 13,733 20,207
Cash - beginning of period 97,254 92,077
Cash - end of period 110,987 112,284
Supplemental disclosures of non-cash investing and financing activities:    
Acquisitions of equipment through capital leases $ 95 $ 4