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Schedule II. Condensed Financial Information Of Registrant (Statements of Cash Flows) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows (used in) provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Net (loss) income attributable to RenaissanceRe | $ 2,143 | $ (499,217) | $ 176,738 | $ 97,947 | $ 75,031 | $ 152,420 | $ 141,921 | $ 133,590 | $ (222,389) | $ 502,962 | $ 431,192
Less: equity in net loss (income) of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Adjustments to reconcile net (loss) income to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Net realized and unrealized (gains) losses on investments | 7,716 | $ (42,052) | $ (58,113) | (43,373) | 49,967 | $ (59,870) | $ (69,772) | (61,653) | (135,822) | (141,328) | 68,918
Other |  |  |  |  |  |  |  |  | 538,100 | 99,943 | 13,140
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 1,045,787 | 484,772 | 424,985
Cash flows provided by (used in) investing activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from maturities and sales of fixed maturity investments trading |  |  |  |  |  |  |  |  | 9,490,669 | 8,102,514 | 9,481,742
Purchases of fixed maturity investments trading |  |  |  |  |  |  |  |  | (10,093,532) | (8,282,720) | (9,683,068)
Net (purchases) sales of short term investments |  |  |  |  |  |  |  |  | 364,011 | (118,617) | 669,116
Dividends and return of capital from subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net purchase of Platinum |  |  |  |  |  |  |  |  | 0 | 0 | (678,152)
Net cash used in investing activities |  |  |  |  |  |  |  |  | (142,434) | (164,532) | (339,039)
Cash flows provided by (used in) financing activities |  |  |  |  |  |  |  |  |  |  |
Dividends paid – RenaissanceRe common shares |  |  |  |  |  |  |  |  | (51,370) | (51,583) | (53,967)
Dividends paid – preference shares |  |  |  |  |  |  |  |  | (22,381) | (22,381) | (22,381)
RenaissanceRe common share repurchases |  |  |  |  |  |  |  |  | (188,591) | (309,434) | (259,874)
Taxes paid on withholding shares |  |  |  |  |  |  |  |  | (15,139) | (14,943) | (10,248)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 28,860 | (401,331) | (93,913)
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 940,435 | (85,728) | (18,699)
Cash and cash equivalents, beginning of period |  |  |  | 421,157 |  |  |  | 506,885 | 421,157 | 506,885 | 525,584
Cash and cash equivalents, end of period | 1,361,592 |  |  |  | 421,157 |  |  |  | 1,361,592 | 421,157 | 506,885
Parent Company |  |  |  |  |  |  |  |  |  |  |
Cash flows (used in) provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Net (loss) income attributable to RenaissanceRe |  |  |  |  |  |  |  |  | (222,389) | 502,962 | 431,192
Less: equity in net loss (income) of subsidiaries |  |  |  |  |  |  |  |  | 212,708 | (516,533) | (463,526)
Loss before equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (9,681) | (13,571) | (32,334)
Adjustments to reconcile net (loss) income to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Net realized and unrealized (gains) losses on investments |  |  |  |  |  |  |  |  | 1,357 | (4,151) | 2,080
Other |  |  |  |  |  |  |  |  | 4,215 | 14,213 | 1,289
Net cash provided by operating activities |  |  |  |  |  |  |  |  | (4,109) | (3,509) | (28,965)
Cash flows provided by (used in) investing activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from maturities and sales of fixed maturity investments trading |  |  |  |  |  |  |  |  | 261,601 | 314,568 | 63,824
Purchases of fixed maturity investments trading |  |  |  |  |  |  |  |  | (344,463) | (336,345) | (161,183)
Net (purchases) sales of short term investments |  |  |  |  |  |  |  |  | 243,571 | (111,814) | (116,461)
Dividends and return of capital from subsidiaries |  |  |  |  |  |  |  |  | 478,496 | 617,239 | 1,584,624
Contributions to subsidiaries |  |  |  |  |  |  |  |  | (669,672) | (108,674) | (294,733)
Due to (from) subsidiary |  |  |  |  |  |  |  |  | 319,646 | 23,758 | 207,996
Net purchase of Platinum |  |  |  |  |  |  |  |  | 0 | 0 | (904,433)
Net cash used in investing activities |  |  |  |  |  |  |  |  | 289,179 | 398,732 | 379,634
Cash flows provided by (used in) financing activities |  |  |  |  |  |  |  |  |  |  |
Dividends paid – RenaissanceRe common shares |  |  |  |  |  |  |  |  | (51,370) | (51,583) | (53,967)
Dividends paid – preference shares |  |  |  |  |  |  |  |  | (22,381) | (22,381) | (22,381)
RenaissanceRe common share repurchases |  |  |  |  |  |  |  |  | (188,591) | (309,434) | (259,874)
Taxes paid on withholding shares |  |  |  |  |  |  |  |  | (15,139) | (14,943) | (10,248)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (277,481) | (398,341) | (346,470)
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 7,589 | (3,118) | 4,199
Cash and cash equivalents, beginning of period |  |  |  | $ 7,067 |  |  |  | $ 10,185 | 7,067 | 10,185 | 5,986
Cash and cash equivalents, end of period | $ 14,656 |  |  |  | $ 7,067 |  |  |  | $ 14,656 | $ 7,067 | $ 10,185

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- Definition The net amount paid (received) by the reporting entity through acquisition (sale/maturities) of short-term investments with an original maturity that is one year or less which qualify for treatment as an investing activity based on management's intention and intended by management to be liquidated, if necessary, within the current operating cycle. + References No definition available. + Details
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