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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
Mar. 31, 2019
Mar. 31, 2018
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Net reserves as of January 1 $ 3,704,050 $ 3,493,778
Net incurred related to:    
Current year 231,341 203,038
Prior years (4,306) (31,335)
Total net incurred 227,035 171,703
Net paid related to:    
Current year 8,149 9,050
Prior years 300,120 328,129
Total net paid 308,269 337,179
Foreign exchange 1,550 12,104
Amounts acquired 1,858,775 0
Net reserves as of March 31 5,483,141 3,340,406
Reinsurance recoverable as of March 31 2,908,343 1,572,321
Gross reserves as of March 31 $ 8,391,484 $ 4,912,727