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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Operating Activities    
Net income $ 15,338 $ 13,033
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 7,214 7,486
Stock-based compensation 1,354 1,541
Deferred income taxes 1,530 411
Changes in operating assets and liabilities:    
Trade receivables (3,196) (7,187)
Inventories 10,012 (5,062)
Trade accounts payable and accrued expenses (266) (4,485)
Contract liability to customers (1,060) (3,518)
Employee compensation and benefits 127 (8,157)
Product liability (58) 501
Prepaid expenses, other assets and other liabilities (2,384) (4,872)
Income taxes payable 2,460 7
Cash provided by (used for) operating activities 31,071 (10,302)
Investing Activities    
Property, plant and equipment additions (4,094) (2,711)
Purchases of short-term investments (89,535) (44,961)
Proceeds from maturities of short-term investments 69,448 59,763
Cash (used for) provided by investing activities (24,181) 12,091
Financing Activities    
Remittance of taxes withheld from employees related to share-based compensation (1,297)
Dividends paid (3,034) (4,887)
Cash used for financing activities (4,331) (4,887)
Increase (decrease) in cash and cash equivalents 2,559 (3,098)
Cash and cash equivalents at beginning of period 35,420 38,492
Cash and cash equivalents at end of period $ 37,979 $ 35,394