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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Cash flows from operating activities:          
Net income (loss) $ 54,095 $ (457,084) $ 230,812 $ (341,541)  
Adjustments to reconcile net income (loss) to net cash used in operating activities:          
Net investment losses     71,799 14,811  
Net realized and unrealized gains on other investments     (41,924) (56,759)  
Amortization of fixed maturities     20,547 32,528  
Interest in income (loss) of equity method investments     (3,557) 8,402  
Amortization of value of business acquired 39,018 0 149,535 0  
Other amortization and depreciation     32,934 19,279  
Share-based compensation expense, net of cash payments     26,145 1,516  
Non-cash foreign exchange losses     0 24,149 $ 24,000
Bargain purchase gain 0 0 0 (15,044)  
Changes in:          
Accrued interest receivable     1,085 8,730  
Reinsurance recoverable balances     (419,226) 60,522  
Deferred acquisition costs     (214,500) (123,961)  
Prepaid reinsurance premiums     (311,498) (178,464)  
Reserve for loss and loss expenses     179,018 918,511  
Unearned premiums     632,912 540,108  
Insurance and reinsurance balances, net     (290,728) (465,436)  
Other items     67,813 (135,266)  
Net cash provided by operating activities     131,167 312,085  
Cash flows from investing activities:          
Fixed maturities     (6,707,576) (6,250,608)  
Equity securities     (59,040) (108,804)  
Mortgage loans     (78,079) (20,812)  
Other investments     (79,319) (135,526)  
Equity method investments     0 (1,000)  
Short-term investments     (285,103) (20,792)  
Proceeds from the sale of:          
Fixed maturities     5,956,644 5,354,398  
Equity securities     223,098 232,755  
Other investments     211,395 203,896  
Short-term investments     153,687 19,284  
Proceeds from redemption of fixed maturities     982,010 1,546,998  
Proceeds from redemption of short-term investments     37,831 116,261  
Proceeds from the repayment of mortgage loans     70,481 10,702  
Purchase of other assets     (16,918) (25,842)  
Purchase of subsidiary, net     0 (73,067)  
Net cash provided by investing activities     409,111 847,843  
Cash flows from financing activities:          
Repurchase of common shares - open market     0 (266,016)  
Taxes paid on withholding shares     (8,699) (24,480)  
Dividends paid - common shares     (100,770) (102,868)  
Repurchase of preferred shares     0 (351,074)  
Dividends paid - preferred shares     (31,969) (42,188)  
Net cash used in financing activities     (141,438) (786,626)  
Effect of exchange rate changes on foreign currency cash, cash equivalents, and restricted cash     (10,228) 16,318  
Increase in cash, cash equivalents, and restricted cash     388,612 389,620  
Cash, cash equivalents, and restricted cash - beginning of period     1,363,786 1,241,507 1,241,507
Cash, cash equivalents, and restricted cash - end of period $ 1,752,398 $ 1,631,127 1,752,398 1,631,127 $ 1,363,786
Supplemental disclosures of cash flow information:          
Income taxes paid     12,108 8,993  
Interest paid     $ 42,856 $ 34,188