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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Operating Activities    
Net income $ 33,932 $ 19,266
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 14,429 14,972
Stock-based compensation 2,732 3,174
(Gain) loss on sale of assets (48) 53
Deferred income taxes 3,133 1,125
Changes in operating assets and liabilities:    
Trade receivables (1,013) 3,537
Inventories 16,235 (10,047)
Trade accounts payable and accrued expenses 10,465 (10,804)
Contract liability to customers (5,977) (6,202)
Employee compensation and benefits 6,123 (8,119)
Product liability (42) 117
Prepaid expenses, other assets and other liabilities (6,327) (10,157)
Income taxes payable 4,466 (3,340)
Cash provided by (used for) operating activities 78,108 (6,425)
Investing Activities    
Property, plant and equipment additions (5,921) (3,890)
Proceeds from sale of assets 54 14
Purchases of short-term investments (233,466) (118,972)
Proceeds from maturities of short-term investments 154,072 133,736
Cash (used for) provided by investing activities (85,261) 10,888
Financing Activities    
Remittance of taxes withheld from employees related to share-based compensation (1,297) (779)
Dividends paid (9,269) (9,956)
Cash used for financing activities (10,566) (10,735)
Decrease in cash and cash equivalents (17,719) (6,272)
Cash and cash equivalents at beginning of period 35,420 38,492
Cash and cash equivalents at end of period $ 17,701 $ 32,220