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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Net reserves as of January 1 $ 1,345,816 $ 1,462,705 $ 1,686,865
Net incurred related to:      
Current year 610,685 341,745 315,241
Prior years (162,447) (143,798) (143,954)
Total net incurred 448,238 197,947 171,287
Net paid related to:      
Current year 95,747 39,830 32,212
Prior years 459,905 275,006 363,235
Total net paid 555,652 314,836 395,447
Amounts acquired 1,394,117 0 0
Net reserves as of December 31 2,632,519 1,345,816 1,462,705
Reinsurance recoverable as of December 31 134,526 66,694 101,025
Gross reserves as of December 31 2,767,045 1,412,510 1,563,730
Catastrophe Reinsurance      
Net incurred related to:      
Current year 145,951 67,268 109,945
Prior years (70,377) (65,511) (102,037)
Total net incurred 75,574 1,757 7,908
Specialty Reinsurance      
Net incurred related to:      
Current year 336,407 144,411 101,347
Prior years (91,912) (55,909) (34,111)
Total net incurred 244,495 88,502 67,236
Lloyd's      
Net incurred related to:      
Current year 128,327 130,066 103,949
Prior years 340 (16,241) (8,256)
Total net incurred 128,667 113,825 95,693
Other      
Net incurred related to:      
Current year 0 0 0
Prior years (498) (6,137) 450
Total net incurred $ (498) $ (6,137) $ 450