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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, 2017
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
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance $ 58,562,228                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 38,846,447                  
All outstanding liabilities prior to 2008, net of reinsurance 2,451,126                  
Liabilities for unpaid losses and loss expenses, net of reinsurance 22,166,907                  
Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 17,387,267                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 11,037,118                  
All outstanding liabilities prior to 2008, net of reinsurance 1,462,279                  
Liabilities for unpaid losses and loss expenses, net of reinsurance 7,812,428                  
Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 6,541,530                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 2,762,465                  
All outstanding liabilities prior to 2008, net of reinsurance 1,253,109                  
Liabilities for unpaid losses and loss expenses, net of reinsurance 5,032,174                  
Accident Year 2008                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 5,410,125 $ 5,471,441 $ 5,510,523 $ 5,572,963 $ 5,603,554 $ 5,631,593 $ 5,674,761 $ 5,651,657 $ 5,735,428 $ 5,644,208
IBNR (1) [1] 213,925                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 4,897,567 4,827,462 4,704,623 4,568,478 4,352,467 4,049,900 3,539,510 2,934,270 2,051,520 810,334
Accident Year 2008 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,550,910 1,572,735 1,576,186 1,602,265 1,602,838 1,603,603 1,591,632 1,609,615 1,652,541 1,663,877
IBNR (1) [1] 88,242                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 1,336,339 1,314,670 1,273,015 1,243,248 1,196,258 1,127,219 1,040,745 902,212 668,128 333,542
Accident Year 2008 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 707,653 704,961 715,684 734,612 739,681 736,154 708,271 703,215 725,014 719,449
IBNR (1) [1] 87,859                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 506,211 487,269 458,737 426,402 384,408 332,689 273,321 199,416 118,758 $ 36,734
Accident Year 2009                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 4,542,173 4,525,234 4,555,586 4,685,356 4,680,173 4,689,064 4,668,243 4,755,362 4,763,117  
IBNR (1) [1] 293,117                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 3,844,074 3,767,363 3,650,893 3,460,344 3,204,371 2,731,005 2,254,270 1,573,893 657,811  
Accident Year 2009 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,074,915 1,077,364 1,085,620 1,083,440 1,099,591 1,110,034 1,116,873 1,165,458 1,196,599  
IBNR (1) [1] 113,938                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 841,836 820,956 786,808 753,439 705,992 629,310 541,644 401,707 180,134  
Accident Year 2009 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 598,744 593,309 605,977 597,457 609,718 610,454 598,413 610,258 600,639  
IBNR (1) [1] 113,766                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 375,232 356,641 330,288 296,584 253,880 197,024 141,394 86,108 $ 32,230  
Accident Year 2010                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 5,053,432 5,138,545 5,109,862 5,127,836 5,178,036 5,158,742 5,272,265 5,141,028    
IBNR (1) [1] 300,001                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 4,358,655 4,212,573 3,971,942 3,634,321 3,252,357 2,740,308 1,926,916 873,754    
Accident Year 2010 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,315,708 1,330,861 1,340,749 1,333,060 1,335,712 1,352,763 1,351,737 1,334,848    
IBNR (1) [1] 109,971                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 1,085,119 1,049,210 970,233 869,444 807,859 699,133 503,585 246,377    
Accident Year 2010 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 462,697 457,387 469,420 442,587 452,186 471,611 476,512 477,886    
IBNR (1) [1] 109,984                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 253,560 234,676 208,057 174,919 138,582 93,136 49,771 $ 17,312    
Accident Year 2011                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 6,226,953 6,276,173 6,311,990 6,175,271 6,306,319 6,392,279 6,430,567      
IBNR (1) [1] 433,196                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 5,375,172 5,175,876 4,883,707 4,373,375 3,778,977 2,963,941 1,285,733      
Accident Year 2011 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 2,143,025 2,148,365 2,157,092 2,125,718 2,166,994 2,272,204 2,290,233      
IBNR (1) [1] 140,206                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 1,839,294 1,781,055 1,724,586 1,634,216 1,489,716 1,288,721 611,514      
Accident Year 2011 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 514,960 512,353 512,867 486,215 501,552 522,325 511,286      
IBNR (1) [1] 103,802                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 279,203 244,043 208,786 160,643 107,036 60,707 $ 15,913      
Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 5,827,240 5,837,626 5,930,172 5,808,941 5,836,701 5,869,907        
IBNR (1) [1] 566,059                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 4,665,888 4,312,155 3,903,535 3,232,741 2,317,760 979,204        
Accident Year 2012 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,853,661 1,853,238 1,874,339 1,885,005 1,905,585 1,878,343        
IBNR (1) [1] 201,735                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 1,437,667 1,335,374 1,243,382 1,086,961 797,075 320,327        
Accident Year 2012 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 588,802 590,001 599,857 579,745 590,455 585,096        
IBNR (1) [1] 136,156                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 306,890 250,844 200,058 140,378 73,980 $ 25,341        
Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 5,526,922 5,632,776 5,739,200 5,777,217 5,767,068          
IBNR (1) [1] 652,927                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 4,207,557 3,755,115 3,171,205 2,285,432 1,009,683          
Accident Year 2013 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,544,112 1,568,744 1,613,682 1,628,842 1,694,149          
IBNR (1) [1] 203,259                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 1,167,568 1,063,853 950,627 718,050 325,926          
Accident Year 2013 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 591,756 583,130 591,048 563,453 574,810          
IBNR (1) [1] 192,758                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 258,154 204,174 144,761 84,456 $ 28,078          
Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 5,574,378 5,580,769 5,549,389 5,368,693            
IBNR (1) [1] 987,715                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 3,765,670 3,188,259 2,322,853 985,112            
Accident Year 2014 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,447,743 1,469,007 1,499,811 1,495,337            
IBNR (1) [1] 228,278                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 994,171 850,000 672,189 292,747            
Accident Year 2014 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 638,711 632,851 622,339 595,967            
IBNR (1) [1] 209,430                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 253,547 173,489 100,357 $ 38,458            
Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 5,864,953 5,678,720 5,540,823              
IBNR (1) [1] 1,405,335                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 3,277,189 2,217,824 997,289              
Accident Year 2015 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,516,094 1,510,101 1,565,814              
IBNR (1) [1] 346,943                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 880,530 603,969 282,178              
Accident Year 2015 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 651,499 654,917 653,037              
IBNR (1) [1] 235,018                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 224,010 120,215 $ 44,148              
Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 6,427,610 6,182,999                
IBNR (1) [1] 2,013,460                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 2,769,701 1,233,032                
Accident Year 2016 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,901,157 1,888,793                
IBNR (1) [1] 553,465                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 846,509 343,057                
Accident Year 2016 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 717,677 720,574                
IBNR (1) [1] 368,766                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 166,561 $ 67,099                
Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 8,108,442                  
IBNR (1) [1] 4,386,436                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 1,684,974                  
Accident Year 2017 | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 3,039,942                  
IBNR (1) [1] 1,950,688                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance 608,085                  
Accident Year 2017 | Casualty and Other Long-Tail Lines | Reinsurance Segment                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Expenses, Net of Reinsurance 1,069,031                  
IBNR (1) [1] 808,467                  
Cumulative Paid Losses and Allocated Loss Expenses, Net of Reinsurance $ 139,097                  
[1] Total IBNR Liabilities Plus Expected Development on Reported Claims