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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Cash flows from operating activities: |  |
Net income | $ 303,072 | $ 163,852
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 32,472 | 25,457
Deferred tax expense | 6,863 | 14,834
Net realized investment (gains) losses | (4,388) | (8,592)
Change in certain assets and liabilities: |  |
Accrued investment income | (2,217) | 2,915
Reinsurance recoverable on loss reserves | (16,111) | (41,803)
Reinsurance recoverable on paid losses | (37) | 170
Premium receivable | (593) | 1,559
Deferred insurance policy acquisition costs | (1,069) | (2,114)
Profit commission receivable | (4,464) | 32,331
Loss reserves | 55,699 | 242,062
Unearned premiums | (23,348) | (37,071)
Return premium accrual | 2,500 | (1,900)
Current income taxes | (1,357) | 26,371
Other, net | 2,400 | 2,054
Net cash provided by operating activities | 349,422 | 420,125
Cash flows from investing activities: |  |
Purchases of investments | (1,097,418) | (992,722)
Proceeds from sales of investments | 142,754 | 476,639
Proceeds from maturity of fixed income securities | 548,727 | 469,559
Additions to property and equipment | (1,405) | (942)
Net cash provided by (used in) investing activities | (407,342) | (47,466)
Cash flows from financing activities: |  |
Repurchase of common stock | 0 | (119,997)
Dividends paid | (41,186) | (41,426)
Payment of withholding taxes related to share-based compensation net share settlement | (6,621) | (8,899)
Net cash provided by (used in) financing activities | (47,807) | (170,322)
Net increase (decrease) in cash and cash equivalents and restricted cash and cash equivalents | (105,727) | 202,337
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 | $ 190,953 | $ 371,393

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