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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Net reserves as of January 1     $ 2,568,730 $ 2,632,519
Net incurred related to:        
Current year $ 187,691 $ 197,005 351,766 325,214
Prior years (45,104) (29,255) (16,098) (30,859)
Total net incurred 142,587 167,750 335,668 294,355
Net paid related to:        
Current year     19,885 11,070
Prior years     285,046 297,716
Total net paid     304,931 308,786
Foreign exchange     19,753 4,149
Net reserves as of June 30 2,619,220 2,622,237 2,619,220 2,622,237
Reinsurance recoverable as of June 30 370,586 222,006 370,586 222,006
Gross reserves as of June 30 $ 2,989,806 $ 2,844,243 $ 2,989,806 $ 2,844,243