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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 30, 2011
Dec. 31, 2010
Jan. 01, 2010
Cash flows from operating activities:      
Net income $ 33,122 $ 33,138 $ (9,001)
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 47,695 46,447 47,229
Stock-based compensation 12,082 6,884 5,204
(Gain) loss on cost method investments, net (4,232) 150 0
Electrochem Litigation charge (gain) 0 (9,500) 34,500
Electrochem Litigation settlement 0 (25,000) 0
Intangible asset write-down 0 0 15,921
Other non-cash (gains) losses (676) 743 (559)
Deferred income taxes 8,776 15,419 (10,120)
Changes in operating assets and liabilities:      
Accounts receivable (13,477) 10,922 5,876
Inventories (2,139) 7,406 6,898
Prepaid expenses and other assets (590) 2,111 (2,364)
Accounts payable 4,236 (7,568) (12,668)
Accrued expenses 3,678 (1,472) (5,050)
Income taxes payable 1,446 (2,795) (4,100)
Net cash provided by (used in) operating activities 89,921 76,885 71,766
Cash flows from investing activities:      
Acquisition of property, plant and equipment (22,489) (16,140) (19,674)
Proceeds from sale of property, plant and equipment 212 2,537 114
Proceeds from sale of cost method investments, net 10,315 0 (1,050)
Acquisitions, net of cash acquired (66,493) 0 0
Other investing activities (1,934) (321) (531)
Net cash provided by (used in) investing activities (80,389) (13,924) (21,141)
Cash flows from financing activities:      
Principal payments of long-term debt (40,000) (78,450) (46,000)
Proceeds from issuance of long-term debt 45,000 0 12,000
Issuance of common stock 2,401 659 212
Payment of debt issuance costs (2,213) 0 0
Other financing activities (1,500) (1,030) (718)
Net cash provided by (used in) financing activities 3,688 (78,821) (34,506)
Effect of foreign currency exchange rates on cash and cash equivalents 405 879 (318)
Net increase (decrease) in cash and cash equivalents 13,625 (14,981) 15,801
Cash and cash equivalents, beginning of period 22,883 37,864 22,063
Cash and cash equivalents, end of period $ 36,508 $ 22,883 $ 37,864