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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Cash flows from operating activities:    
Net income $ 59,250 $ 20,710
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 14,491 12,644
Amortization 20,249 20,248
Reduction in the carrying amount of right-of-use assets 4,294 3,921
Stock-based compensation expense 16,774 17,088
Provision for excess and obsolete inventories 9,763 8,046
Gain on contingent consideration (3,771) 0
Other adjustments to reconcile net income to net cash provided by operating activities (977) 152
Changes in assets and liabilities:    
Accounts receivable 5,712 10,580
Inventories (18,566) (17,246)
Prepaid expenses and other current assets 5,619 3,727
Other assets 219 (595)
Accounts payable 18,054 10,074
Accrued liabilities 4,754 (856)
Other liabilities 272 2,374
Deferred revenues 3,806 3,625
Operating lease liabilities (4,496) (3,660)
Net cash provided by operating activities 124,209 83,378
Cash flows from investing activities:    
Acquisition of property, plant and equipment (41,887) (14,242)
Acquisition of business, net of cash acquired (34,999) 0
Proceeds from sale of a subsidiary 82 93
Purchases of marketable securities 50,330 33,704
Net cash used in investing activities (56,195) (40,047)
Net cash used in investing activities    
Payments to Acquire Marketable Securities 29,721 59,602
Cash flows from financing activities:    
Proceeds from issuances of common stock 9,588 7,672
Tax withholdings related to net share settlements of equity awards (15,382) (7,898)
Proceeds from term loan debt 18,000 0
Principal repayments on term loans (41,098) (18,750)
Payment of term loan debt issuance costs (78) 0
Net cash used in financing activities (28,970) (18,976)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 1,262 (161)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 40,306 24,194
Net increase in cash, cash equivalents and restricted cash 147,937 100,546
Cash, cash equivalents and restricted cash, beginning of period 188,243 124,740
Fair value of stock options and restricted stock-based awards assumed in connection with acquisition of Cascade Microtech    
Change in accounts payable and accrued liabilities related to property, plant and equipment purchases 3,041 1,062
Operating lease, right-of-use assets obtained in exchange for lease obligations 1,549 36,300
Supplemental disclosure of cash flow information:    
Cash paid for income taxes, net 7,475 2,875
Cash paid for interest $ 683 $ 1,128