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Reserve for Claims and Claim Expenses (Schedule of Liability for Unpaid Claims and Claims Adjustment Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Net reserves as of January 1     $ 3,493,778 $ 2,568,730
Net incurred related to:        
Current year $ 216,396 $ 187,691 419,434 351,766
Prior years (156,229) (45,104) (187,564) (16,098)
Total net incurred 60,167 142,587 231,870 335,668
Net paid related to:        
Current year     23,902 19,885
Prior years     445,790 285,046
Total net paid     469,692 304,931
Foreign exchange     (8,602) 19,753
Net reserves as of June 30 3,247,354 2,619,220 3,247,354 2,619,220
Reinsurance recoverable as of June 30 1,454,991 370,586 1,454,991 370,586
Gross reserves as of June 30 $ 4,702,345 $ 2,989,806 $ 4,702,345 $ 2,989,806