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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income (loss) $ (368,969) $ 513,368 $ 641,631
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Net realized investment (gains) losses (28,226) 60,525 138,491
Net realized and unrealized gains on other investments (72,763) (38,669) (20,148)
Amortization of fixed maturities 43,292 65,921 97,223
Interest in loss of equity method investments 8,402 2,094 0
Other amortization and depreciation 81,471 24,573 26,341
Share-based compensation expense, net of cash payments 12,667 52,211 43,052
Non-cash foreign exchange losses 24,149 0 0
Bargain purchase gain (15,044) 0 0
Changes in:      
Accrued interest receivable (4,353) (885) 8,908
Reinsurance recoverable balances (131,160) (176,532) (214,992)
Deferred acquisition costs (35,076) 33,212 (4,744)
Prepaid reinsurance premiums (56,377) (158,809) (46,955)
Reserve for loss and loss expenses 1,004,578 54,476 151,011
Unearned premiums (56,603) 198,938 29,841
Insurance and reinsurance balances, net (81,831) (209,895) (74,578)
Other items (64,928) (13,804) 16,119
Net cash provided by operating activities 259,229 406,724 791,200
Purchases of:      
Fixed maturities (8,714,990) (9,176,728) (11,011,979)
Equity securities (106,136) (302,554) (356,617)
Mortgage loans (31,077) (148,450) (206,191)
Other investments (153,150) (190,370) (83,561)
Equity method investments (1,000) (107,913) 0
Short-term investments (41,609) (190,747) (80,069)
Proceeds from the sale of:      
Fixed maturities 7,004,973 7,905,316 9,432,226
Equity securities 448,058 305,642 275,357
Other investments 260,943 215,578 252,418
Short-term investments 49,280 54,165 125,311
Proceeds from redemption of fixed maturities 2,009,982 1,492,588 1,407,806
Proceeds from redemption of short-term investments 119,427 36,546 23,687
Proceeds from the repayment of mortgage loans 56,435 5,040 0
Purchase of other assets (42,685) (27,149) (33,683)
Change in restricted cash and cash equivalents (213,147) (15,395) 29,598
Purchase of subsidiaries, net (466,941) 0 0
Net cash provided by (used in) investing activities 178,363 (144,431) (225,697)
Cash flows from financing activities:      
Net proceeds from issuance of debt 346,362 0 0
Repayment of notes payable 67,242 0 0
Net proceeds from issuance of preferred shares 0 531,945 0
Repurchase of common shares - open market (261,180) (495,426) (314,204)
Taxes paid on withholding shares (24,678) (14,329) (18,048)
Dividends paid - common shares (135,032) (132,323) (118,652)
Repurchase of preferred shares (351,074) (51,769) 0
Dividends paid - preferred shares (52,844) (39,909) (40,088)
Proceeds from issuance of common shares 0 224 3,986
Net cash used in financing activities (545,688) (201,587) (487,006)
Effect of exchange rate changes on foreign currency cash and cash equivalents 17,228 (9,345) (12,194)
Increase (decrease) in cash and cash equivalents (90,868) 51,361 66,303
Cash and cash equivalents - beginning of year 1,039,494 988,133 921,830
Cash and cash equivalents - end of year 948,626 1,039,494 988,133
Supplemental disclosures of cash flow information:      
Income taxes paid 0 12,041 12,661
Interest paid $ 49,945 $ 48,875 $ 48,875