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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 138,304 | $ 58,840 | $ 103,885
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Amortization of deferred revenue and recognition of unbilled receivables | (135,368) | (68,905) | (11,122)
Depreciation | 12,456 | 8,612 | 4,919
Amortization of intangibles | 21,962 | 21,962 | 21,983
Change in excess inventory reserve | 5,938 | 3,630 | 0
Amortization of premium and discount on investments, net | (6,643) | (6,131) | (2,871)
Stock-based compensation to employees | 16,148 | 12,432 | 12,284
Stock-based compensation to Board of Directors and Scientific Advisory Board | 1,548 | 4,364 | 2,609
Change in earnout liability recorded for Adesis acquisition |  |  | 519
Deferred income tax (benefit) expense | (5,776) | (12,814) | 24,396
Retirement plan expense | 5,818 | 4,466 | 4,351
Decrease (increase) in assets: |  |  |
Accounts receivable | (17,323) | 9,226 | (27,361)
Inventory | 109 | (37,365) | (18,951)
Other current assets | (15,238) | 4,860 | (3,884)
Deferred income taxes |  | 20,682 |
Other assets | (13,291) | (63,922) | (297)
Increase (decrease) in liabilities: |  |  |
Accounts payable and accrued expenses | 15,516 | 1,563 | 16,420
Other current liabilities | (5,183) | 5,761 | (1,917)
Deferred revenue | 157,321 | 130,639 | 8,402
Other liabilities | 17,614 | 23,896 |
Net cash provided by operating activities | 193,912 | 121,796 | 133,365
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of property and equipment | (30,059) | (25,391) | (29,803)
Purchase of intangibles | (401) |  |
Purchases of investments | (931,854) | (628,789) | (594,283)
Proceeds from sale of investments | 723,600 | 633,179 | 498,508
Net cash used in investing activities | (238,714) | (21,001) | (125,578)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from issuance of common stock | 889 | 798 | 734
Repurchase of common stock | (649) | (477) |
Proceeds from the exercise of common stock options |  |  | 38
Payment of withholding taxes related to stock-based compensation to employees | (15,980) | (11,620) | (9,432)
Cash dividends paid | (18,853) | (11,314) | (5,652)
Net cash used in financing activities | (34,593) | (22,613) | (14,312)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS | (79,395) | 78,182 | (6,525)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR | 211,022 | 132,840 | 139,365
CASH AND CASH EQUIVALENTS, END OF YEAR | $ 131,627 | $ 211,022 | $ 132,840

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- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are 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 13 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition Amount of cost (reversal of cost) for pension and other postretirement benefits. + References No definition available. + Details
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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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