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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 58,840,000 | $ 103,885,000 | $ 48,070,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Amortization of deferred revenue and recognition of unbilled receivables | (68,905,000) | (11,122,000) | (7,406,000)
Depreciation | 8,612,000 | 4,919,000 | 4,270,000
Amortization of intangibles | 21,962,000 | 21,983,000 | 16,492,000
Inventory write-down | 3,630,000 | 0 | 0
Amortization of premium and discount on investments, net | (6,131,000) | (2,871,000) | (1,830,000)
Stock-based compensation to employees | 12,432,000 | 12,284,000 | 11,374,000
Stock-based compensation to Board of Directors and Scientific Advisory Board | 4,364,000 | 2,609,000 | 1,715,000
Change in earnout liability recorded for Adesis acquisition |  | 519,000 |
Deferred income tax (benefit) expense | (12,814,000) | 24,396,000 | 3,094,000
Excess tax benefits from share-based payment arrangements |  |  | (4,232,000)
Retirement plan benefit expense | 4,466,000 | 4,351,000 | 3,965,000
Decrease (increase) in assets: |  |  |
Accounts receivable | 9,226,000 | (27,361,000) | 1,205,000
Inventory | (37,365,000) | (18,951,000) | (4,460,000)
Other current assets | 4,860,000 | (3,884,000) | (3,870,000)
Deferred income taxes | 20,682,000 |  |
Other assets | (63,922,000) | (297,000) | (133,000)
Increase (decrease) in liabilities: |  |  |
Accounts payable and accrued expenses | 1,563,000 | 16,420,000 | 4,362,000
Other current liabilities | 5,761,000 | (1,917,000) | 4,362,000
Deferred revenue | 130,639,000 | 8,402,000 | 3,360,000
Other liabilities | 23,896,000 |  |
Net cash provided by operating activities | 121,796,000 | 133,365,000 | 80,338,000
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of property and equipment | (25,391,000) | (29,803,000) | (7,300,000)
Purchase of intangibles |  |  | (95,989,000)
Purchase of business, net of cash acquired |  |  | (33,380,000)
Purchases of investments | (628,789,000) | (594,283,000) | (450,277,000)
Proceeds from sale of investments | 633,179,000 | 498,508,000 | 548,474,000
Net cash used in investing activities | (21,001,000) | (125,578,000) | (38,472,000)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from issuance of common stock | 798,000 | 734,000 | 439,000
Repurchase of common stock | (477,000) |  |
Proceeds from the exercise of common stock options |  | 38,000 | 185,000
Payment of withholding taxes related to stock-based compensation to employees | (11,620,000) | (9,432,000) | (4,870,000)
Excess tax benefits from share-based payment arrangements |  |  | 4,232,000
Cash dividends paid | (11,314,000) | (5,652,000) |
Net cash used in financing activities | (22,613,000) | (14,312,000) | (14,000)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 78,182,000 | (6,525,000) | 41,852,000
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR | 132,840,000 | 139,365,000 | 97,513,000
CASH AND CASH EQUIVALENTS, END OF YEAR | $ 211,022,000 | $ 132,840,000 | $ 139,365,000

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 25 -Paragraph 19A -URI http://asc.fasb.org/extlink&oid=107668666&loc=SL79513924-113897 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + 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 (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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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=109223946&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=109223946&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=109223946&loc=d3e3213-108585 + 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=109223946&loc=d3e3255-108585 + Details
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