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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015
Cash flows from operating activities: |  |
Net income | $ 235,030 | $ 1,069,582
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 44,324 | 38,361
Deferred tax expense (benefit) | 111,191 | (698,177)
Realized investment gains, net | (8,984) | (27,133)
Excess tax benefits related to share-based compensation | (100) | (2,113)
Loss on debt extinguishment | 31,071 | 0
Payment of original issue discount-convertible junior subordinated debentures | (41,540) | 0
Payment of original issue discount-convertible senior notes | (11,250) | 0
Change in certain assets and liabilities: |  |
Accrued investment income | (2,086) | (6,343)
Prepaid insurance premium | 95 | 47,436
Reinsurance recoverable on loss reserves | (2,376) | 19,093
Reinsurance recoverable on paid losses | (1,313) | 2,149
Premium receivable | 1,048 | 5,863
Deferred insurance policy acquisition costs | (2,167) | (2,757)
Profit commission receivable | (2,005) | 91,500
Loss reserves | (357,919) | (416,864)
Premium deficiency reserve | 0 | (23,751)
Unearned premiums | 41,353 | 61,705
Return premium accrual | (12,800) | (6,400)
Income taxes payable - current | 822 | 752
Other | 9,235 | (17,872)
Net cash provided by operating activities | 31,629 | 135,031
Purchases of investments: |  |
Fixed maturities | (1,105,995) | (1,970,402)
Equity securities | (4,315) | (2,593)
Proceeds from sales of fixed maturities | 718,894 | 1,527,680
Proceeds from maturity of fixed maturities | 432,557 | 432,328
Proceeds from sale of equity securities | 6,425 | 0
Net increase in payable for securities | 3,376 | 48,120
Net decrease in restricted cash | 0 | 17,212
Additions to property and equipment | (4,969) | (2,835)
Net cash provided by investing activities | 45,973 | 49,510
Cash flows from financing activities: |  |
Proceeds from issuance of long-term debt | 573,094 | 0
Purchase of convertible senior notes | (363,778) | 0
Purchase of convertible junior subordinated debentures-liability component | (91,110) | 0
Purchase of convertible junior subordinated debentures-equity component | (9,750) | 0
Purchase of common stock | (91,597) | 0
Payment of debt issuance costs | (938) | 0
Excess tax benefits related to share-based compensation | 100 | 2,113
Net cash provided by financing activities | 16,021 | 2,113
Net increase in cash and cash equivalents | 93,623 | 186,654
Cash and cash equivalents at beginning of period | 181,120 | 197,882
Cash and cash equivalents at end of period | $ 274,743 | $ 384,536

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