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Losses and Loss Expenses - Information about incurred and paid claims development - Reinsurance - Casualty and Other Long-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                  
Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 5,902,204                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 2,538,105                  
All outstanding liabilities prior to 2007, net of reinsurance 1,144,033                  
Liabilities for unpaid losses and loss expenses, net of reinsurance 4,508,132                  
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 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 639,849 651,467 669,419 681,785 695,585 690,765 676,117 700,940 703,048 718,204
IBNR (1) [1] 78,528                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 468,113 447,168 424,561 393,840 356,252 306,316 232,835 164,621 84,851 $ 25,613
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 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 678,937 686,164 703,423 708,486 706,072 679,497 674,780 692,648 690,723  
IBNR (1) [1] 98,734                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 468,478 440,883 410,055 369,801 320,010 262,291 190,723 113,045 $ 35,159  
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 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 573,329 584,313 575,441 587,796 587,768 576,600 586,519 575,577    
IBNR (1) [1] 122,432                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 344,040 318,446 286,229 244,869 190,388 136,283 82,205 $ 30,676    
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 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 443,596 455,349 428,949 437,742 456,264 459,804 459,467      
IBNR (1) [1] 123,644                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 228,543 202,518 170,216 135,204 90,713 48,316 $ 16,909      
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 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 496,831 496,471 469,869 485,114 503,228 493,507        
IBNR (1) [1] 136,487                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 236,974 202,436 155,535 103,925 58,760 $ 15,582        
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 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 568,801 577,407 554,961 565,972 558,979          
IBNR (1) [1] 178,637                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 244,617 195,084 136,725 72,058 $ 24,410          
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 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 562,801 569,174 539,884 546,981            
IBNR (1) [1] 233,903                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 197,131 140,190 81,183 $ 26,736            
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 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 604,270 596,948 569,234              
IBNR (1) [1] 287,078                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 168,189 96,775 $ 37,072              
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 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 629,312 626,052                
IBNR (1) [1] 379,676                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 117,007 $ 43,015                
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 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 704,478                  
IBNR (1) [1] 535,503                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance $ 65,013                  
[1] Total IBNR Liabilities Plus Expected Development on Reported Claims