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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net income | $ 91,472,000 | $ 92,228,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Amortization of deferred revenue and recognition of unbilled receivables | (125,196,000) | (110,993,000)
Depreciation | 11,529,000 | 9,229,000
Amortization of intangibles | 11,000,000 | 10,985,000
Change in excess inventory reserve | 688,000 | 1,117,000
Amortization of premium and discount on investments, net | (1,027,000) | (128,000)
Stock-based compensation to employees | 14,282,000 | 14,624,000
Stock-based compensation to Board of Directors and Scientific Advisory Board | 774,000 | 704,000
Deferred income tax expense (benefit) | (2,282,000) | 1,458,000
Retirement plan expense | 2,718,000 | 4,457,000
Decrease (increase) in assets: |  |
Accounts receivable | 32,706,000 | (17,368,000)
Inventory | (32,163,000) | (14,179,000)
Other current assets | (13,030,000) | (5,712,000)
Other assets | 7,522,000 | (15,005,000)
Increase (decrease) in liabilities: |  |
Accounts payable and accrued expenses | (7,126,000) | (17,036,000)
Other current liabilities | (3,343,000) | (2,536,000)
Deferred revenue | 92,976,000 | 92,816,000
Other liabilities | 4,630,000 | 14,455,000
Net cash provided by operating activities | 86,130,000 | 59,116,000
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Purchases of property and equipment | (21,336,000) | (20,668,000)
Purchases of intangibles | (12,000) | (394,000)
Purchases of investments | (287,919,000) | (193,951,000)
Proceeds from sale and maturity of investments | 161,530,000 | 100,000,000
Net cash used in investing activities | (147,737,000) | (115,013,000)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Proceeds from issuance of common stock | 847,000 | 787,000
Payment of withholding taxes related to stock-based compensation to employees | (8,844,000) | (13,018,000)
Cash dividends paid | (28,493,000) | (18,970,000)
Net cash used in financing activities | (36,490,000) | (31,201,000)
DECREASE IN CASH AND CASH EQUIVALENTS | (98,097,000) | (87,098,000)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD | 311,993,000 | 630,012,000
CASH AND CASH EQUIVALENTS, END OF PERIOD | $ 213,896,000 | $ 542,914,000

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