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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Cash flows from operating activities: |  |
Net income | $ 512,351 | $ 328,447
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 45,267 | 48,882
Deferred tax expense | 145,397 | 165,250
Net realized investment losses | 1,112 | 227
Loss on debt extinguishment | 0 | 65
Change in certain assets and liabilities: |  |
Accrued investment income | 694 | 1,145
Reinsurance recoverable on loss reserves | 15,193 | 4,615
Reinsurance recoverable on paid losses | 761 | 326
Premium receivable | 2,405 | (1,546)
Deferred insurance policy acquisition costs | 176 | (1,265)
Profit commission receivable | (9,098) | (3,899)
Loss reserves | (264,589) | (333,662)
Unearned premiums | 14,680 | 41,079
Return premium accrual | (18,600) | (18,000)
Current income taxes | (75,393) | 34,974
Other, net | 13,191 | (10,282)
Net cash provided by operating activities | 383,547 | 256,356
Cash flows from investing activities: |  |
Purchases of investments | (1,074,849) | (775,043)
Proceeds from sales of investments | 338,939 | 233,198
Proceeds from maturity of fixed income securities | 594,679 | 547,699
Net increase in payable for securities | 43,679 | 3,738
Additions to property and equipment | (10,659) | (12,121)
Net cash used in investing activities | (108,211) | (2,529)
Cash flows from financing activities: |  |
Proceeds from revolving credit facility | 0 | 150,000
Repayment of revolving credit facility | 0 | (150,000)
Purchase or repayment of convertible senior notes | 0 | (145,620)
Payment of original issue discount - convertible senior notes | 0 | (4,504)
Repurchase of common stock | (100,059) | 0
Payment of debt issuance costs | 0 | (1,630)
Payment of withholding taxes related to share-based compensation net share settlement | (8,131) | (6,782)
Net cash used in financing activities | (108,190) | (158,536)
Net increase in cash and cash equivalents | 167,146 | 95,291
Cash and cash equivalents at beginning of period | 99,851 | 155,410
Cash and cash equivalents at end of period | $ 266,997 | $ 250,701

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=98514028&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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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