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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 29, 2014
Mar. 30, 2013
Cash flows from operating activities:    
Net loss $ (3,347) $ (12,103)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 3,452 3,131
Share-based compensation expense 1,517 1,421
Deferred income taxes (415) (751)
Other accrued liabilities 133 257
Changes in current assets and liabilities, excluding effects from acquisitions:    
Accounts receivable (6,201) 1,733
Inventories (3,538) (1,210)
Other current assets (1,141) (504)
Accounts payable 925 (982)
Deferred profit 265 3,328
Income taxes payable, including excess stock option exercise benefit 72 902
Accrued compensation, warranty and other liabilities (664) (1,725)
Net cash used in operating activities (8,942) (6,503)
Cash flows from investing activities, excluding effects from acquisitions:    
Payment for purchase of Ismeca, net of cash received   (53,463)
Sales and maturities of short-term investments 125 113
Purchases of property, plant and equipment (730) (209)
Other assets 111 11
Net cash used in investing activities (494) (53,548)
Cash flows from financing activities:    
Cash dividends paid (1,504)  
Repurchase of common stock (765) (419)
Net cash used in financing activities (2,269) (419)
Effect of exchange rate changes on cash and cash equivalents 80 (945)
Net decrease in cash and cash equivalents (11,625) (61,415)
Cash and cash equivalents at beginning of period 51,668 [1] 102,808
Cash and cash equivalents at end of period 40,043 41,393
Supplemental disclosure of cash flow information:    
Cash paid (refunded) for income taxes 310 (1,458)
Inventory capitalized as property, plant and equipment 61 390
Dividends declared but not yet paid $ 1,507 $ 1,478
[1] Derived from December 28, 2013 audited financial statements