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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
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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

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