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Reserve for Claims and Claim Expenses (Incurred and Paid Claims Development) (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 claims and claim expenses, net of reinsurance $ 7,732,540                  
IBNR and ACR 1,641,732                  
Cumulative paid claims and claim expenses, net of reinsurance 5,423,909                  
Outstanding liabilities from accident year 2006 and prior, net of reinsurance 226,695                  
Claims and claim expenses, net of reinsurance, from the Company's former Bermuda-based insurance operations 2,114                  
Adjustment for unallocated claim expenses 20,256                  
Unamortized fair value adjustments recorded in connection with the acquisition of Platinum 11,034                  
Liability for claims and claim expenses, net of reinsurance 2,568,730                  
Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 3,600,130                  
IBNR and ACR 395,680                  
Cumulative paid claims and claim expenses, net of reinsurance 3,023,772                  
Outstanding liabilities from accident year 2006 and prior, net of reinsurance 3,865                  
Adjustment for unallocated claim expenses 2,394                  
Unamortized fair value adjustments recorded in connection with the acquisition of Platinum 1,419                  
Liability for claims and claim expenses, net of reinsurance 584,036                  
Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 4,132,410                  
IBNR and ACR 1,246,052                  
Cumulative paid claims and claim expenses, net of reinsurance 2,400,137                  
Outstanding liabilities from accident year 2006 and prior, net of reinsurance 222,830                  
Adjustment for unallocated claim expenses 17,862                  
Unamortized fair value adjustments recorded in connection with the acquisition of Platinum 9,615                  
Liability for claims and claim expenses, net of reinsurance 1,982,580                  
2007                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 770,219 $ 774,396 $ 766,845 $ 778,185 $ 806,487 $ 868,747 $ 911,337 $ 958,206 $ 1,025,247 $ 1,113,667
IBNR and ACR 67,726                  
Cumulative paid claims and claim expenses, net of reinsurance 682,644 657,017 638,348 613,200 588,997 541,511 469,657 371,280 281,119 91,877
2007 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 199,383 198,666 199,792 206,168 213,228 234,120 246,823 250,975 309,228 387,866
IBNR and ACR 397                  
Cumulative paid claims and claim expenses, net of reinsurance 199,893 198,654 197,735 197,533 194,327 190,603 187,998 172,512 150,938 45,530
2007 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 570,836 575,730 567,053 572,017 593,259 634,627 664,514 707,231 716,019 725,801
IBNR and ACR 67,329                  
Cumulative paid claims and claim expenses, net of reinsurance 482,751 458,363 440,613 415,667 394,670 350,908 281,659 198,768 130,181 $ 46,347
2008                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 1,247,506 1,262,048 1,272,298 1,294,396 1,317,055 1,390,282 1,408,748 1,429,241 1,469,251  
IBNR and ACR 48,658                  
Cumulative paid claims and claim expenses, net of reinsurance 1,140,094 1,118,434 1,090,977 1,060,160 1,013,041 937,678 797,242 591,482 275,968  
2008 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 684,281 683,658 691,030 700,312 715,285 748,918 752,501 752,349 851,049  
IBNR and ACR 919                  
Cumulative paid claims and claim expenses, net of reinsurance 682,539 681,131 679,303 675,595 661,664 628,673 538,944 391,008 247,162  
2008 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 563,225 578,390 581,268 594,084 601,770 641,364 656,247 676,892 618,202  
IBNR and ACR 47,739                  
Cumulative paid claims and claim expenses, net of reinsurance 457,555 437,303 411,674 384,565 351,377 309,005 258,298 200,474 $ 28,806  
2009                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 522,566 527,374 536,393 557,623 582,725 622,181 639,182 704,560    
IBNR and ACR 30,006                  
Cumulative paid claims and claim expenses, net of reinsurance 462,192 455,919 434,257 395,580 363,190 319,313 267,983 96,378    
2009 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 134,359 134,059 134,722 134,013 138,131 144,352 163,124 218,607    
IBNR and ACR 411                  
Cumulative paid claims and claim expenses, net of reinsurance 132,731 131,823 130,858 126,433 120,839 113,279 99,400 56,065    
2009 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 388,207 393,315 401,671 423,610 444,594 477,829 476,058 485,953    
IBNR and ACR 29,595                  
Cumulative paid claims and claim expenses, net of reinsurance 329,461 324,096 303,399 269,147 242,351 206,034 168,583 $ 40,313    
2010                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 863,129 854,924 864,328 867,523 898,572 946,271 988,403      
IBNR and ACR 79,809                  
Cumulative paid claims and claim expenses, net of reinsurance 709,672 620,545 549,898 495,847 425,914 309,807 126,401      
2010 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 558,982 549,097 545,333 527,126 522,678 557,062 605,753      
IBNR and ACR 35,715                  
Cumulative paid claims and claim expenses, net of reinsurance 469,028 393,497 367,495 332,275 289,918 211,124 91,585      
2010 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 304,147 305,827 318,995 340,397 375,894 389,209 382,650      
IBNR and ACR 44,094                  
Cumulative paid claims and claim expenses, net of reinsurance 240,644 227,048 182,403 163,572 135,996 98,683 $ 34,816      
2011                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 1,314,451 1,349,227 1,377,450 1,454,063 1,533,946 1,611,509        
IBNR and ACR 113,383                  
Cumulative paid claims and claim expenses, net of reinsurance 1,145,239 1,101,596 1,013,577 861,359 522,071 249,556        
2011 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 1,007,368 1,036,122 1,056,822 1,103,441 1,153,960 1,230,463        
IBNR and ACR 48,082                  
Cumulative paid claims and claim expenses, net of reinsurance 921,820 896,001 838,968 716,364 409,111 201,650        
2011 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 307,083 313,105 320,628 350,622 379,986 381,046        
IBNR and ACR 65,301                  
Cumulative paid claims and claim expenses, net of reinsurance 223,419 205,595 174,609 144,995 112,960 $ 47,906        
2012                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 651,764 679,446 705,316 767,534 862,333          
IBNR and ACR 132,561                  
Cumulative paid claims and claim expenses, net of reinsurance 459,269 415,911 356,102 265,612 165,581          
2012 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 275,504 293,136 310,842 343,561 436,244          
IBNR and ACR 38,243                  
Cumulative paid claims and claim expenses, net of reinsurance 218,060 208,115 188,744 144,861 100,044          
2012 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 376,260 386,310 394,474 423,973 426,089          
IBNR and ACR 94,318                  
Cumulative paid claims and claim expenses, net of reinsurance 241,209 207,796 167,358 120,751 $ 65,537          
2013                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 465,948 504,401 552,965 614,066            
IBNR and ACR 127,969                  
Cumulative paid claims and claim expenses, net of reinsurance 283,707 240,046 177,423 86,344            
2013 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 149,197 170,629 192,681 223,542            
IBNR and ACR 15,879                  
Cumulative paid claims and claim expenses, net of reinsurance 125,744 115,043 91,436 48,550            
2013 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 316,751 333,772 360,284 390,524            
IBNR and ACR 112,090                  
Cumulative paid claims and claim expenses, net of reinsurance 157,963 125,003 85,987 $ 37,794            
2014                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 600,956 613,360 657,958              
IBNR and ACR 155,602                  
Cumulative paid claims and claim expenses, net of reinsurance 268,806 199,632 110,863              
2014 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 146,689 153,770 182,518              
IBNR and ACR 14,820                  
Cumulative paid claims and claim expenses, net of reinsurance 118,304 95,758 55,101              
2014 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 454,267 459,590 475,440              
IBNR and ACR 140,782                  
Cumulative paid claims and claim expenses, net of reinsurance 150,502 103,874 $ 55,762              
2015                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 620,623 635,553                
IBNR and ACR 343,935                  
Cumulative paid claims and claim expenses, net of reinsurance 192,864 95,712                
2015 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 192,593 224,669                
IBNR and ACR 62,748                  
Cumulative paid claims and claim expenses, net of reinsurance 108,173 62,173                
2015 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 428,030 410,884                
IBNR and ACR 281,187                  
Cumulative paid claims and claim expenses, net of reinsurance 84,691 $ 33,539                
2016                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 675,378                  
IBNR and ACR 542,083                  
Cumulative paid claims and claim expenses, net of reinsurance 79,422                  
2016 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 251,774                  
IBNR and ACR 178,466                  
Cumulative paid claims and claim expenses, net of reinsurance 47,480                  
2016 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 423,604                  
IBNR and ACR 363,617                  
Cumulative paid claims and claim expenses, net of reinsurance $ 31,942