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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |
Net income | $ 446,093 | $ 673,763 | $ 670,097
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and other amortization | 57,812 | 48,784 | 58,215
Deferred tax expense | 27,475 | 11,096 | 186,572
Loss on debt extinguishment | 26,736 | 0 | 0
Net realized investment (gains) losses | (13,752) | (5,306) | 1,353
Change in certain assets and liabilities: |  |  |
Accrued investment income | (292) | (1,704) | (1,941)
Reinsurance recoverable on loss reserves | (73,401) | 11,687 | 15,146
Reinsurance recoverable on paid losses | 852 | 1,427 | 924
Premiums receivable | (457) | (497) | (1,045)
Deferred insurance policy acquisition costs | (3,030) | (643) | 953
Profit commission receivable | 4,586 | 4,945 | (5,479)
Loss reserves | 325,203 | (118,685) | (311,616)
Unearned premiums | (93,203) | (29,683) | 17,051
Return premium accrual | (500) | (11,500) | (22,900)
Current income taxes | 6,271 | 1,057 | (77,551)
Other, net | 21,916 | 24,791 | 14,738
Net cash provided by operating activities | 732,309 | 609,532 | 544,517
Cash flows from investing activities: |  |  |
Purchases of investments | (2,636,972) | (1,394,126) | (1,459,473)
Proceeds from sales of investments | 836,851 | 229,796 | 370,449
Proceeds from maturity of fixed income securities | 1,030,926 | 748,165 | 785,175
Net decrease in payables for securities | 0 | (307) | 307
Additions to property and equipment | (3,311) | (5,636) | (14,238)
Net cash used in investing activities | (772,506) | (422,108) | (317,780)
Cash flows from financing activities: |  |  |
Proceeds from issuance of senior notes | 640,250 | 0 | 0
Purchase of senior notes | (179,735) | 0 | 0
Payment of original issue discount - senior notes | (2,969) | 0 | 0
Purchase of convertible junior subordinated debentures | (36,392) | 0 | 0
Payment of original issue discount- convertible junior subordinated debentures | (15,049) | 0 | 0
Cash portion of loss on debt extinguishment | (25,266) | 0 | 0
Repurchase of common stock | (119,997) | (125,766) | (163,419)
Dividends paid | (82,061) | (41,914) | 0
Payment of debt issuance costs | (2,020) | 0 | 0
Payment of withholding taxes related to share-based compensation net share settlement | (8,940) | (5,726) | (8,131)
Net cash provided by (used in) financing activities | 167,821 | (173,406) | (171,550)
Net increase in cash and cash equivalents and restricted cash and cash equivalents | 127,624 | 14,018 | 55,187
Cash and cash equivalents and restricted cash and cash equivalents at beginning of year | 169,056 | 155,038 | 99,851
Cash and cash equivalents and restricted cash and cash equivalents at end of year | $ 296,680 | $ 169,056 | $ 155,038

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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the purchase of all investments (debt, security, other) 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 13 -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 inflow from a debt initially having maturity 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=118932676&loc=d3e3255-108585 + 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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