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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net income | $ 38,155,000 | $ 31,474,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Amortization of deferred revenue and recognition of unbilled receivables | (40,511,000) | (26,976,000)
Depreciation | 3,615,000 | 2,758,000
Amortization of intangibles | 5,490,000 | 5,486,000
Change in excess inventory reserve | 611,000 | 224,000
Amortization of premium and discount on investments, net | (2,005,000) | (1,741,000)
Stock-based compensation to employees | 5,735,000 | 3,610,000
Stock-based compensation to Board of Directors and Scientific Advisory Board | 254,000 | 516,000
Deferred income tax expense (benefit) | 940,000 | (592,000)
Retirement plan expense | 1,414,000 | 1,501,000
Decrease (increase) in assets: |  |
Accounts receivable | (22,140,000) | (8,995,000)
Inventory | (10,726,000) | 1,735,000
Other current assets | 7,706,000 | 177,000
Other assets | (3,245,000) | (2,966,000)
Increase (decrease) in liabilities: |  |
Accounts payable and accrued expenses | (29,340,000) | (12,117,000)
Other current liabilities | 3,114,000 | 3,744,000
Deferred revenue | 43,685,000 | 33,080,000
Other liabilities | 2,994,000 | 3,132,000
Net cash provided by operating activities | 5,746,000 | 34,050,000
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Purchases of property and equipment | (4,782,000) | (13,283,000)
Purchases of intangibles |  | (401,000)
Purchases of investments | (148,592,000) | (165,471,000)
Proceeds from sale of investments | 250,400,000 | 170,050,000
Net cash provided by (used in) investing activities | 97,026,000 | (9,105,000)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Proceeds from issuance of common stock | 259,000 | 204,000
Repurchase of common stock |  | (649,000)
Payment of withholding taxes related to stock-based compensation to employees | (4,816,000) | (5,757,000)
Cash dividends paid | (7,098,000) | (4,717,000)
Net cash used in financing activities | (11,655,000) | (10,919,000)
INCREASE IN CASH AND CASH EQUIVALENTS | 91,117,000 | 14,026,000
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD | 131,627,000 | 211,022,000
CASH AND CASH EQUIVALENTS, END OF PERIOD | $ 222,744,000 | $ 225,048,000

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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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