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Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Operating Activities |  |
Net income (loss) | $ 1,194,372 | $ 377,715
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |
Net realized (gains) losses | (379,049) | (194,776)
Equity in net (income) or loss of investment funds accounted for using the equity method and other income or loss | (181,028) | 125,384
Amortization of intangible assets | 29,688 | 33,120
Share-based compensation | 57,564 | 41,912
Changes in: |  |
Reserve for losses and loss adjustment expenses, net of unpaid losses and loss adjustment expenses recoverable | 948,505 | 1,158,446
Unearned premiums, net of ceded unearned premiums | 838,650 | 395,759
Premiums receivable | (781,391) | (463,638)
Deferred acquisition costs | (214,893) | (92,437)
Reinsurance balances payable | 331,461 | 132,161
Other items, net | (231,307) | (192,066)
Net cash provided by (used for) operating activities | 1,612,572 | 1,321,580
Investing Activities |  |
Purchases of fixed maturity investments | (23,554,384) | (25,410,849)
Purchases of equity securities | (620,774) | (1,025,149)
Purchases of other investments | (1,033,134) | (501,692)
Proceeds from sales of fixed maturity investments | 23,130,388 | 24,833,030
Proceeds from sales of equity securities | 542,290 | 580,346
Proceeds from sales, redemptions and maturities of other investments | 772,549 | 472,188
Proceeds from redemptions and maturities of fixed maturity investments | 805,836 | 369,240
Net settlements of derivative instruments | 17,286 | 150,471
Net (purchases) sales of short-term investments | (378,086) | (1,323,363)
Change in cash collateral related to securities lending | (826) | 54,596
Purchase of operating affiliate | (546,349) | 0
Purchases of fixed assets | (23,585) | (17,687)
Other | (204,889) | 8,679
Net cash provided by (used for) investing activities | (1,093,678) | (1,810,190)
Financing Activities |  |
Proceeds from issuance of preferred shares, net | 485,821 | 0
Purchases of common shares under share repurchase program | (485,315) | (75,486)
Proceeds from common shares issued, net | 185 | (9,661)
Proceeds from borrowings | 0 | 1,004,918
Repayments of borrowings | 0 | (165,000)
Change in cash collateral related to securities lending | 826 | (54,596)
Third party investment in non-redeemable noncontrolling interests | 15,971 | (2,867)
Dividends paid to redeemable noncontrolling interests | (1,907) | (2,540)
Other | 27,639 | (2,625)
Preferred dividends paid | (20,805) | (20,806)
Net cash provided by (used for) financing activities | 22,415 | 671,337
Effects of exchange rate changes on foreign currency cash and restricted cash | (13,390) | (21,742)
Increase (decrease) in cash and restricted cash | 527,919 | 160,985
Cash and restricted cash, beginning of year | 1,290,544 | 903,698
Cash and restricted cash, end of period | $ 1,818,463 | $ 1,064,683

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