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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Net reserves as of beginning of period     $ 3,704,050 $ 3,493,778
Net incurred related to:        
Current year $ 453,140 $ 216,396 684,481 419,434
Prior years 233 (156,229) (4,073) (187,564)
Total net incurred 453,373 60,167 680,408 231,870
Net paid related to:        
Current year     52,332 23,902
Prior years     570,561 445,790
Total net paid     622,893 469,692
Amounts acquired     1,858,775 0
Foreign exchange     (642) (8,602)
Net reserves as of end of period 5,619,698 3,247,354 5,619,698 3,247,354
Reinsurance recoverable as of end of period 2,865,150 1,454,991 2,865,150 1,454,991
Gross reserves as of end of period $ 8,484,848 $ 4,702,345 $ 8,484,848 $ 4,702,345