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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Income from continuing operations $ 18,985 $ 39,992
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 13,891 13,031
Benefit from deferred income taxes (15,882) (141)
Provision for returns and doubtful accounts 3,662 2,086
Compensation expense related to equity compensation plans 3,380 1,363
Return of common stock 0 (7,890)
Excess tax benefit from exercises of stock options (517) (222)
Loss on dispositions and abandonment 43 72
Changes in operating assets and liabilities:    
Accounts receivable (2,275) 19,398
Inventories 62,205 29,517
Prepaid expenses and other current assets (8,407) (6,288)
Accounts payable, accrued expenses and other current liabilities (27,926) (45,119)
Net cash provided by operating activities from continuing operations 47,159 45,799
Net cash used in operating activities from discontinued operations (410) (70)
Net cash provided by operating activities 46,749 45,729
Cash flows from investing activities:    
Purchases of property, plant and equipment (11,389) (9,145)
Proceeds from disposals of property, plant and equipment 93 25
Net cash used in investing activities (11,296) (9,120)
Cash flows from financing activities:    
Borrowings on credit facility and short term debt 0 10,861
Repayments of borrowings on credit facility and short term debt 0 (10,861)
Repayments of capital lease obligations (2,031) (1,996)
Proceeds from issuance of common stock 342 205
Proceeds from recovery zone bond 0 624
Excess tax benefit from exercises of stock options 517 222
Net cash used in financing activities from continuing operations (1,172) (945)
Net cash used in financing activities from discontinued operations 0 (193)
Net cash (used in) provided by financing activities (1,172) (1,138)
Effects of exchange rates on cash 1,935 (1,129)
Net increase in cash 36,216 34,342
Cash - beginning of period 97,254 92,077
Cash - end of period 133,470 126,419
Supplemental disclosures of non-cash investing and financing activities:    
Acquisitions of equipment through capital leases $ 1,174 $ 628