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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Operating activities: |  |
Net income | $ 454,000 | $ 394,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 41,000 | 47,000
Deferred income taxes | 6,000 | 19,000
Share-based compensation | 28,000 | 19,000
Loss (gain) on debt repayment | 5,000 | (17,000)
Other, net | (1,000) | 7,000
Changes in operating assets and liabilities: |  |
Receivables | (174,000) | 91,000
Prepaid expenses and other current assets | (157,000) | 18,000
Medical claims and benefits payable | 106,000 | (194,000)
Amounts due government agencies | 201,000 | 17,000
Accounts payable, accrued liabilities and other | 251,000 | (61,000)
Deferred revenue | (195,000) | (181,000)
Income taxes | 184,000 | (3,000)
Net cash provided by operating activities | 749,000 | 156,000
Investing activities: |  |
Purchases of investments | (670,000) | (1,162,000)
Proceeds from sales and maturities of investments | 750,000 | 791,000
Purchases of property, equipment and capitalized software | (45,000) | (20,000)
Other, net | 3,000 | (2,000)
Net cash provided by (used in) investing activities | 38,000 | (393,000)
Financing activities: |  |
Proceeds from senior notes offering, net of issuance costs | 789,000 | 0
Repayment of term loan facility | (600,000) | 0
Common stock purchases | (453,000) | 0
Proceeds from borrowings under term loan facility | 380,000 | 220,000
Cash paid for partial termination of warrants | (30,000) | (424,000)
Cash paid for partial settlement of conversion option | (27,000) | (473,000)
Cash received for partial settlement of call option | 27,000 | 473,000
Repayment of principal amount of convertible senior notes | (12,000) | (185,000)
Other, net | (3,000) | 27,000
Net cash provided by (used in) financing activities | 71,000 | (362,000)
Net increase (decrease) in cash, cash equivalents, and restricted cash and cash equivalents | 858,000 | (599,000)
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period | 2,508,000 | 2,926,000
Cash, cash equivalents, and restricted cash and cash equivalents at end of period | 3,366,000 | 2,327,000
Schedule of non-cash investing and financing activities: |  |
Common stock used for share-based compensation | (8,000) | (7,000)
Details of change in fair value of derivatives, net: |  |
Change in fair value of derivatives, net | 0 | 0
Call option |  |
Details of change in fair value of derivatives, net: |  |
Change in fair value of derivatives, net | (2,000) | 166,000
Conversion option |  |
Details of change in fair value of derivatives, net: |  |
Change in fair value of derivatives, net | $ 2,000 | $ (166,000)

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- Definition The aggregate amount paid by the entity to reacquire the right to purchase equity shares at a predetermined price, usually issued together with corporate debt. + 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=121586364&loc=d3e3291-108585 + 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=121586364&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + 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 (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer). + 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 (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + 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 (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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- Definition The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + 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 (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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