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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 184,213 $ 133,372 $ 138,304
Adjustments to reconcile net income to net cash provided by operating activities:      
Amortization of deferred revenue and recognition of unbilled receivables, net (225,549) (183,997) (135,368)
Depreciation 19,968 15,217 12,456
Amortization of intangibles 21,994 21,969 21,962
Change in excess inventory reserve 3,554 1,114 5,938
Amortization of premium and discount on investments, net (373) (4,960) (6,643)
Stock-based compensation to employees 34,871 26,631 16,148
Stock-based compensation to Board of Directors and Scientific Advisory Board 1,404 1,647 1,548
Deferred income tax expense (benefit) 1,748 (4,446) (5,776)
Retirement plan expense 8,875 5,656 5,818
Decrease (increase) in assets:      
Accounts receivable (25,378) (21,809) (17,323)
Inventory (46,123) (28,752) 109
Other current assets 22,413 6,497 (15,238)
Other assets (36,139) (13,481) (13,291)
Increase (decrease) in liabilities:      
Accounts payable and accrued expenses 1,902 (8,305) 15,516
Other current liabilities 2,105 2,683 (5,183)
Deferred revenue 201,484 192,369 157,321
Other liabilities 20,136 7,387 17,614
Net cash provided by operating activities 191,105 148,792 193,912
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchases of property and equipment (43,161) (27,991) (30,059)
Purchase of intangibles (394) (60) (401)
Purchases of investments (642,180) (604,153) (931,854)
Proceeds from sale and maturity of investments 227,984 1,023,460 723,600
Net cash (used in) provided by investing activities (457,751) 391,256 (238,714)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from issuance of common stock 1,507 1,176 889
Repurchase of common stock 0 0 (649)
Payment of withholding taxes related to stock-based compensation to employees (14,949) (14,394) (15,980)
Cash dividends paid (37,931) (28,445) (18,853)
Net cash used in financing activities (51,373) (41,663) (34,593)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (318,019) 498,385 (79,395)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 630,012 131,627 211,022
CASH AND CASH EQUIVALENTS, END OF YEAR $ 311,993 $ 630,012 $ 131,627