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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net income | $ 92,228,000 | $ 38,970,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Amortization of deferred revenue and recognition of unbilled receivables | (110,993,000) | (58,644,000)
Depreciation | 9,229,000 | 7,283,000
Amortization of intangibles | 10,985,000 | 10,980,000
Change in excess inventory reserve | 1,117,000 | 611,000
Amortization of premium and discount on investments, net | (128,000) | (3,280,000)
Stock-based compensation to employees | 14,624,000 | 12,918,000
Stock-based compensation to Board of Directors and Scientific Advisory Board | 704,000 | 708,000
Deferred income tax expense (benefit) | 1,458,000 | (336,000)
Retirement plan expense | 4,457,000 | 2,828,000
Decrease (increase) in assets: |  |
Accounts receivable | (17,368,000) | (8,046,000)
Inventory | (14,179,000) | (21,181,000)
Other current assets | (5,712,000) | (5,967,000)
Other assets | (15,005,000) | (5,942,000)
Increase (decrease) in liabilities: |  |
Accounts payable and accrued expenses | (17,036,000) | (20,332,000)
Other current liabilities | (2,536,000) | (639,000)
Deferred revenue | 92,816,000 | 75,683,000
Other liabilities | 14,455,000 | 6,416,000
Net cash provided by operating activities | 59,116,000 | 32,030,000
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Purchases of property and equipment | (20,668,000) | (11,804,000)
Purchases of intangibles | (394,000) | (25,000)
Purchases of investments | (193,951,000) | (404,232,000)
Proceeds from sale and maturity of investments | 100,000,000 | 412,760,000
Net cash used in investing activities | (115,013,000) | (3,301,000)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Proceeds from issuance of common stock | 787,000 | 590,000
Payment of withholding taxes related to stock-based compensation to employees | (13,018,000) | (13,165,000)
Cash dividends paid | (18,970,000) | (14,215,000)
Net cash used in financing activities | (31,201,000) | (26,790,000)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS | (87,098,000) | 1,939,000
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD | 630,012,000 | 131,627,000
CASH AND CASH EQUIVALENTS, END OF PERIOD | $ 542,914,000 | $ 133,566,000

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