Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash Flows from Operating Activities
Net income	$ 38,026	$ 17,835
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	19,100	19,634
Non-cash interest expense	719	10,762
Deferred income taxes	(43)	(12)
Share-based compensation expense	16,969	11,735
Changes in operating assets and liabilities:
Accounts receivable and contract assets	(44,948)	(12,987)
Inventories	(18,117)	(24,879)
Prepaid expenses and other current assets	8,388	9,829
Accounts payable and accrued expenses	(6,072)	21,786
Customer deposits and deferred revenue	59,149	(6,532)
Income taxes receivable and payable, net	(296)	823
Other, net	2,499	2,655
Net cash provided by (used in) operating activities	75,374	50,649
Cash Flows from Investing Activities
Capital expenditures	(21,771)	(31,453)
Proceeds from the sale of investments	44,592	199,475
Payments for purchases of investments	(43,982)	(225,112)
Net cash provided by (used in) investing activities	(21,161)	(57,090)
Cash Flows from Financing Activities
Proceeds (net of tax withholdings) from option exercises and employee stock purchase plan	2,909	2,709
Restricted stock tax withholdings	(7,818)	(4,260)
Net cash provided by (used in) financing activities	(4,909)	(1,551)
Effect of exchange rate changes on cash and cash equivalents	(108)	(60)
Net increase (decrease) in cash, cash equivalents, and restricted cash	49,196	(8,052)
Cash, cash equivalents, and restricted cash - beginning of period	120,472	130,283
Cash, cash equivalents, and restricted cash - end of period	169,668	122,231
Supplemental Disclosure of Cash Flow Information
Interest paid	7,760	9,039
Income taxes paid (refunds received)	1,349	(130)
Non-cash activities
Capital expenditures included in accounts payable and accrued expenses	6,709	9,133
Net transfer of inventory to property, plant and equipment	1,235	(253)
Right-of-use assets obtained in exchange for lease obligations	$ 375	$ 20,353