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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Cash flows from operating activities: |  |
Net income | $ 150,021 | $ 149,805
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 17,422 | 13,052
Deferred tax expense | 2,635 | 15,877
Net realized investment (gains) losses | (2,215) | (1,891)
Change in certain assets and liabilities: |  |
Accrued investment income | (1,130) | 2,763
Reinsurance recoverable on loss reserves | (7,859) | (4,115)
Reinsurance recoverable on paid losses | 63 | (170)
Premium receivable | 937 | 2,147
Deferred insurance policy acquisition costs | (774) | (983)
Profit commission receivable | (5,430) | 1,121
Loss reserves | 32,573 | 19,419
Unearned premiums | (13,546) | (14,894)
Return premium accrual | 2,900 | (400)
Current income taxes | 36,897 | 22,527
Other, net | (14,461) | (19,934)
Net cash provided by operating activities | 198,033 | 184,324
Cash flows from investing activities: |  |
Purchases of investments | (652,328) | (280,614)
Proceeds from sales of investments | 59,378 | 224,803
Proceeds from maturity of fixed income securities | 318,892 | 222,544
Additions to property and equipment | (441) | (580)
Net cash provided by (used in) investing activities | (274,499) | 166,153
Cash flows from financing activities: |  |
Repurchase of common stock | 0 | (119,997)
Dividends paid | (20,827) | (21,111)
Payment of withholding taxes related to share-based compensation net share settlement | (6,621) | (8,899)
Net cash provided by (used in) financing activities | (27,448) | (150,007)
Net increase (decrease) in cash and cash equivalents and restricted cash and cash equivalents | (103,914) | 200,470
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period | 296,680 | 169,056
Cash and cash equivalents and restricted cash and cash equivalents at end of period | $ 192,766 | $ 369,526

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