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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Cash flows from operating activities: |  |
Net income | $ 143,637 | $ 89,798
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 15,833 | 17,079
Deferred tax expense | 39,388 | 48,932
Net realized investment losses | 329 | 125
Change in certain assets and liabilities: |  |
Accrued investment income | 937 | 287
Reinsurance recoverable on loss reserves | 3,000 | 3,835
Reinsurance recoverable on paid losses | 154 | (165)
Premium receivable | 1,344 | 485
Deferred insurance policy acquisition costs | (87) | (477)
Profit commission receivable | 377 | (3,395)
Loss reserves | (61,464) | (103,771)
Unearned premiums | 4,754 | 7,585
Return premium accrual | (5,500) | (4,800)
Income taxes payable - current | (3,117) | 34,654
Other, net | (5,619) | (12,703)
Net cash provided by operating activities | 133,966 | 77,469
Purchases of investments: |  |
Fixed income securities | (209,477) | (187,077)
Equity securities | (20) | (19)
Proceeds from sales of fixed income securities | 10,844 | 33,980
Proceeds from maturity of fixed income securities | 155,605 | 199,234
Net increase in payable for securities | 0 | 10,336
Additions to property and equipment | (5,208) | (4,014)
Net cash (used in) provided by investing activities | (48,256) | 52,440
Cash flows from financing activities: |  |
Proceeds from revolving credit facility | 0 | 150,000
Payment of debt issuance costs | 0 | (1,523)
Payment of withholding taxes related to share-based compensation net share settlement | (8,073) | (6,722)
Net cash (used in) provided by financing activities | (8,073) | 141,755
Net increase in cash and cash equivalents | 77,637 | 271,664
Cash and cash equivalents at beginning of period | 99,851 | 155,410
Cash and cash equivalents at end of period | $ 177,488 | $ 427,074

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- Definition The cash inflow associated with the sale of debt securities classified as available-for-sale securities. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration