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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 | $ 673,763 | $ 670,097 | $ 355,761
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and other amortization | 48,784 | 58,215 | 64,430
Deferred tax expense | 11,096 | 186,572 | 355,044
Net realized investment (gains) losses | (5,306) | 1,353 | (231)
Loss on debt extinguishment | 0 | 0 | 65
Change in certain assets and liabilities: |  |  |
Accrued investment income | (1,704) | (1,941) | (1,987)
Reinsurance recoverable on loss reserves | 11,687 | 15,146 | 2,019
Reinsurance recoverable on paid losses | 1,427 | 924 | 1,092
Premiums receivable | (497) | (1,045) | (1,653)
Deferred insurance policy acquisition costs | (643) | 953 | (1,082)
Profit commission receivable | 4,945 | (5,479) | (2,844)
Loss reserves | (118,685) | (311,616) | (453,178)
Unearned premiums | (29,683) | 17,051 | 63,197
Return premium accrual | (11,500) | (22,900) | (25,400)
Current income taxes | 1,057 | (77,551) | 51,296
Other, net | 24,791 | 14,738 | 128
Net cash provided by operating activities | 609,532 | 544,517 | 406,657
Cash flows from investing activities: |  |  |
Purchases of investments | (1,394,126) | (1,459,473) | (1,293,695)
Proceeds from sales of investments | 229,796 | 370,449 | 246,908
Proceeds from maturity of fixed income securities | 748,165 | 785,175 | 759,212
Net (decrease) increase in payables for securities | (307) | 307 | 0
Additions to property and equipment | (5,636) | (14,238) | (16,066)
Net cash used in investing activities | (422,108) | (317,780) | (303,641)
Cash flows from financing activities: |  |  |
Proceeds from revolving credit facility | 0 | 0 | 150,000
Repayment of revolving credit facility | 0 | 0 | (150,000)
Purchase or repayment of convertible senior notes | 0 | 0 | (145,620)
Payment of original issue discount - convertible senior notes | 0 | 0 | (4,504)
Repurchase of common stock | (125,766) | (163,419) | 0
Dividends paid | (41,914) | 0 | 0
Payment of debt issuance costs | 0 | 0 | (1,630)
Payment of withholding taxes related to share-based compensation net share settlement | (5,726) | (8,131) | (6,821)
Net cash used in financing activities | (173,406) | (171,550) | (158,575)
Net increase (decrease) in cash and cash equivalents and restricted cash and cash equivalents | 14,018 | 55,187 | (55,559)
Cash and cash equivalents and restricted cash and cash equivalents at beginning of year | 155,038 | 99,851 | 155,410
Cash and cash equivalents and restricted cash and cash equivalents at end of year | $ 169,056 | $ 155,038 | $ 99,851

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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=118932676&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=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3151-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth 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 12 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + 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=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow for payment of an obligation from a 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 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 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=26873400&loc=d3e23780-122690 + Details
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