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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Cash flows from operating activities: |  |
Net income | $ 496,653 | $ 512,351
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 35,778 | 45,267
Deferred tax expense | 7,628 | 145,397
Net realized investment (gains) losses | (3,986) | 1,112
Change in certain assets and liabilities: |  |
Accrued investment income | (319) | 694
Reinsurance recoverable on loss reserves | 13,762 | 15,193
Reinsurance recoverable on paid losses | 1,375 | 761
Premium receivable | 3,286 | 2,405
Deferred insurance policy acquisition costs | (122) | 176
Profit commission receivable | 3,868 | (9,098)
Loss reserves | (71,722) | (264,589)
Unearned premiums | (17,429) | 14,680
Return premium accrual | (9,600) | (18,600)
Current income taxes | (8,765) | (75,393)
Other, net | 7,756 | 13,191
Net cash provided by operating activities | 458,163 | 383,547
Cash flows from investing activities: |  |
Purchases of investments | (1,043,003) | (1,074,849)
Proceeds from sales of investments | 201,369 | 338,939
Proceeds from maturity of fixed income securities | 536,747 | 594,679
Net increase in payable for securities | 0 | 43,679
Additions to property and equipment | (4,079) | (10,659)
Net cash used in investing activities | (308,966) | (108,211)
Cash flows from financing activities: |  |
Repurchase of common stock | (105,766) | (100,059)
Dividends paid | (20,989) | 0
Payment of withholding taxes related to share-based compensation net share settlement | (5,726) | (8,131)
Net cash used in financing activities | (132,481) | (108,190)
Net increase in cash and cash equivalents and restricted cash and cash equivalents | 16,716 | 167,146
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period | 155,038 | 99,851
Cash and cash equivalents and restricted cash and cash equivalents at end of period | $ 171,754 | $ 266,997

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