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Reserve for Claims and Claim Expenses (Schedule of Liability for Unpaid Claims and Claims Adjustment Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Net reserves as of January 1 $ 2,568,730 $ 2,632,519 $ 1,345,816
Net incurred related to:      
Current year 1,902,424 694,957 610,685
Prior years (40,996) (164,126) (162,447)
Total net incurred 1,861,428 530,831 448,238
Net paid related to:      
Current year 450,527 83,015 95,747
Prior years 524,298 506,279 425,565
Total net paid 974,825 589,294 521,312
Amounts acquired 0 0 1,394,117
Foreign exchange 38,445 (5,326) (34,340)
Net reserves as of December 31 3,493,778 2,568,730 2,632,519
Reinsurance recoverable as of December 31 1,586,630 279,564 134,526
Gross reserves as of December 31 $ 5,080,408 $ 2,848,294 $ 2,767,045