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Losses and Loss Expenses - Information about incurred and paid claims development - Reinsurance - Property and Other Short-Tail LInes (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2007
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance $ 53,162,870                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 35,612,206                  
All outstanding liabilities prior to 2007, net of reinsurance 2,501,779                  
Liabilities for unpaid losses and loss expenses, net of reinsurance 20,052,443                  
Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 15,130,780                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 9,853,346                  
All outstanding liabilities prior to 2007, net of reinsurance 1,431,871                  
Liabilities for unpaid losses and loss expenses, net of reinsurance 6,709,305                  
Property and other short-tail lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 9,228,576                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 7,315,241                  
All outstanding liabilities prior to 2007, net of reinsurance 287,838                  
Liabilities for unpaid losses and loss expenses, net of reinsurance 2,201,173                  
Accident Year 2007                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 4,390,981 $ 4,432,150 $ 4,519,599 $ 4,541,978 $ 4,569,019 $ 4,689,256 $ 4,684,540 $ 4,718,961 $ 4,806,850 $ 4,632,657
IBNR (1) [1] 246,827                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 3,894,280 3,822,207 3,744,872 3,612,934 3,397,370 3,126,834 2,587,918 2,055,288 1,289,961 521,083
Accident Year 2007 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,144,626 1,157,375 1,201,176 1,224,302 1,239,171 1,246,925 1,252,940 1,292,265 1,315,895 1,373,989
IBNR (1) [1] 88,476                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 951,136 925,230 922,262 897,073 848,114 793,787 703,600 592,431 359,533 153,912
Accident Year 2007 | Property and other short-tail lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 504,777 505,908 531,757 542,517 543,586 556,160 576,823 591,325 612,847 655,785
IBNR (1) [1] 9,948                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 483,023 478,062 497,701 503,233 491,862 487,471 470,765 427,810 274,682 $ 128,299
Accident Year 2008                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 5,322,204 5,357,648 5,417,072 5,449,364 5,479,907 5,524,325 5,503,422 5,575,015 5,504,796  
IBNR (1) [1] 307,738                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 4,700,567 4,582,409 4,450,875 4,240,640 3,947,203 3,446,415 2,857,474 1,994,235 788,760  
Accident Year 2008 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,535,533 1,535,515 1,559,314 1,559,826 1,561,457 1,550,254 1,567,923 1,605,756 1,613,114  
IBNR (1) [1] 121,015                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 1,285,355 1,244,802 1,216,006 1,170,828 1,104,015 1,019,382 883,897 654,658 327,154  
Accident Year 2008 | Property and other short-tail lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 856,596 849,351 855,891 851,340 855,385 870,757 893,143 913,108 922,391  
IBNR (1) [1] 22,281                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 816,877 803,919 805,951 801,027 784,005 757,091 693,174 541,613 $ 291,995  
Accident Year 2009                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 4,392,904 4,422,167 4,550,542 4,550,362 4,556,902 4,542,408 4,627,569 4,622,547    
IBNR (1) [1] 317,583                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 3,663,224 3,551,474 3,366,917 3,117,922 2,655,163 2,192,791 1,530,295 638,179    
Accident Year 2009 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,046,087 1,052,553 1,049,967 1,067,335 1,076,187 1,084,088 1,128,445 1,150,325    
IBNR (1) [1] 127,390                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 797,666 764,307 732,134 685,901 611,967 526,118 389,499 176,089    
Accident Year 2009 | Property and other short-tail lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 472,758 468,240 474,526 479,539 488,419 507,488 541,926 574,748    
IBNR (1) [1] 4,958                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 453,626 445,861 445,905 441,032 421,579 389,835 307,294 $ 145,413    
Accident Year 2010                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 4,981,939 4,957,474 4,974,782 5,026,101 5,002,061 5,111,634 4,983,044      
IBNR (1) [1] 464,306                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 4,084,244 3,851,827 3,521,163 3,144,278 2,645,868 1,855,407 840,030      
Accident Year 2010 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,284,178 1,295,555 1,286,737 1,290,292 1,302,827 1,302,532 1,280,586      
IBNR (1) [1] 150,491                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 1,011,698 936,971 836,148 774,216 667,841 477,894 232,372      
Accident Year 2010 | Property and other short-tail lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 840,582 840,206 857,788 852,550 846,563 842,728 821,119      
IBNR (1) [1] 26,847                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 783,155 734,453 665,932 639,012 577,128 429,578 $ 215,463      
Accident Year 2011                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 6,083,796 6,116,046 5,980,635 6,111,779 6,187,474 6,236,775        
IBNR (1) [1] 558,008                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 5,021,000 4,737,827 4,242,053 3,664,970 2,872,319 1,246,596        
Accident Year 2011 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 2,082,525 2,089,535 2,059,076 2,102,613 2,201,054 2,222,386        
IBNR (1) [1] 178,659                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 1,730,787 1,675,428 1,588,434 1,448,330 1,255,164 596,906        
Accident Year 2011 | Property and other short-tail lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,585,694 1,593,064 1,589,207 1,617,499 1,697,826 1,728,879        
IBNR (1) [1] 42,172                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 1,493,813 1,472,992 1,432,899 1,344,405 1,196,404 $ 581,324        
Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 5,663,926 5,754,387 5,640,576 5,660,616 5,697,958          
IBNR (1) [1] 715,827                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 4,199,766 3,802,042 3,149,842 2,256,973 952,158          
Accident Year 2012 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,812,667 1,832,972 1,840,530 1,860,740 1,827,087          
IBNR (1) [1] 247,825                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 1,313,092 1,223,403 1,070,442 785,212 318,115          
Accident Year 2012 | Property and other short-tail lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,243,866 1,255,565 1,285,569 1,294,768 1,268,108          
IBNR (1) [1] 69,188                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 1,068,475 1,028,319 933,717 713,154 $ 293,705          
Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 5,426,144 5,523,695 5,554,791 5,558,316            
IBNR (1) [1] 1,082,491                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 3,614,076 3,049,907 2,194,912 976,023            
Accident Year 2013 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,502,096 1,544,739 1,551,432 1,615,956            
IBNR (1) [1] 279,880                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 1,016,654 908,575 685,680 318,270            
Accident Year 2013 | Property and other short-tail lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 939,295 975,565 1,011,548 1,068,975            
IBNR (1) [1] 45,977                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 819,523 768,385 604,497 $ 291,534            
Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 5,397,264 5,369,393 5,183,056              
IBNR (1) [1] 1,396,883                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 3,090,343 2,250,446 957,525              
Accident Year 2014 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,418,828 1,452,029 1,434,902              
IBNR (1) [1] 344,569                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 826,700 653,323 287,780              
Accident Year 2014 | Property and other short-tail lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 814,558 855,081 865,668              
IBNR (1) [1] 57,491                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 658,511 556,548 $ 250,708              
Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 5,498,206 5,354,494                
IBNR (1) [1] 1,962,006                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 2,152,569 970,277                
Accident Year 2015 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,459,003 1,504,763                
IBNR (1) [1] 543,530                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 589,550 279,024                
Accident Year 2015 | Property and other short-tail lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 829,691 878,711                
IBNR (1) [1] 163,854                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 472,543 $ 236,009                
Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 6,005,506                  
IBNR (1) [1] 3,425,518                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 1,192,137                  
Accident Year 2016 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,845,237                  
IBNR (1) [1] 1,067,346                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 330,708                  
Accident Year 2016 | Property and other short-tail lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,140,759                  
IBNR (1) [1] 531,843                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance $ 265,695                  
[1] Total IBNR Liabilities Plus Expected Development on Reported Claims