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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 29, 2012
Jul. 01, 2011
Cash flows from operating activities:    
Net income (loss) $ 8,318 $ 20,494
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 22,104 17,979
Debt related amortization included in interest expense 5,959 5,614
Stock-based compensation 5,533 5,795
(Gain) loss on cost method investments, net 0 (4,232)
Other non-cash (gains) losses (59) 355
Deferred income taxes 45 2,418
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable (12,140) (18,352)
Inventories (4,570) (5,713)
Prepaid expenses and other current assets 538 3
Accounts payable 2,749 5,569
Accrued expenses (8,669) 2,542
Income taxes payable 3,732 5,338
Net cash provided by (used in) operating activities 23,540 37,810
Cash flows from investing activities:    
Acquisition of property, plant and equipment (24,181) (11,523)
Proceeds from sale of cost method investments, net 0 10,365
Acquisitions, net of cash acquired (17,224) 0
Other investing activities 65 (1,929)
Net cash provided by (used in) investing activities (41,340) (3,087)
Cash flows from financing activities:    
Principal payments of long-term debt (18,000) (20,000)
Proceeds from issuance of long-term debt 10,000 0
Issuance of common stock 403 1,968
Payment of debt issuance costs 0 (2,114)
Other financing activities (118) (1,102)
Net cash provided by (used in) financing activities (7,715) (21,248)
Effect of foreign currency exchange rates on cash and cash equivalents 140 584
Net increase (decrease) in cash and cash equivalents (25,375) 14,059
Cash and cash equivalents, beginning of period 36,508 22,883
Cash and cash equivalents, end of period $ 11,133 $ 36,942