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Reserve for Claims and Claim Expenses (Incurred and Paid Claims Development) (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 claims and claim expenses, net of reinsurance $ 8,951,571                  
IBNR and ACR 2,430,824                  
Cumulative paid claims and claim expenses, net of reinsurance 5,772,376                  
Outstanding liabilities from accident year 2007 and prior, net of reinsurance 282,782                  
Claims and claim expenses, net of reinsurance, from the Company's former Bermuda-based insurance operations 673                  
Adjustment for unallocated claim expenses 23,694                  
Unamortized fair value adjustments recorded in connection with the acquisition of Platinum 7,434                  
Liability for claims and claim expenses, net of reinsurance 3,493,778                  
Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 4,809,181                  
IBNR and ACR 1,104,634                  
Cumulative paid claims and claim expenses, net of reinsurance 3,474,410                  
Outstanding liabilities from accident year 2007 and prior, net of reinsurance 4,211                  
Adjustment for unallocated claim expenses 3,352                  
Unamortized fair value adjustments recorded in connection with the acquisition of Platinum 956                  
Liability for claims and claim expenses, net of reinsurance 1,343,290                  
Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 4,142,390                  
IBNR and ACR 1,326,190                  
Cumulative paid claims and claim expenses, net of reinsurance 2,297,966                  
Outstanding liabilities from accident year 2007 and prior, net of reinsurance 278,571                  
Adjustment for unallocated claim expenses 20,342                  
Unamortized fair value adjustments recorded in connection with the acquisition of Platinum 6,478                  
Liability for claims and claim expenses, net of reinsurance 2,149,815                  
Accident Year 2008                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 1,241,116 $ 1,239,405 $ 1,256,183 $ 1,266,331 $ 1,288,248 $ 1,310,946 $ 1,383,378 $ 1,401,967 $ 1,421,816 $ 1,459,436
IBNR and ACR 44,189                  
Cumulative paid claims and claim expenses, net of reinsurance 1,164,647 1,145,149 1,123,287 1,095,431 1,064,412 1,016,658 940,911 800,202 593,570 275,963
Accident Year 2008 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 683,374 683,757 684,834 692,225 701,522 716,537 750,523 754,393 754,840 852,500
IBNR and ACR 130                  
Cumulative paid claims and claim expenses, net of reinsurance 685,874 685,229 683,821 681,988 678,266 664,217 631,204 541,278 392,800 247,123
Accident Year 2008 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 557,742 555,648 571,349 574,106 586,726 594,409 632,855 647,574 666,976 606,936
IBNR and ACR 44,059                  
Cumulative paid claims and claim expenses, net of reinsurance 478,773 459,920 439,466 413,443 386,146 352,441 309,707 258,924 200,770 $ 28,840
Accident Year 2009                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 531,523 528,693 533,597 542,653 563,850 589,136 628,671 645,608 711,042  
IBNR and ACR 23,021                  
Cumulative paid claims and claim expenses, net of reinsurance 476,298 468,759 462,407 440,320 400,991 367,996 323,183 271,031 96,574  
Accident Year 2009 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 138,732 139,167 138,948 139,676 138,899 143,232 149,830 169,191 224,928  
IBNR and ACR 238                  
Cumulative paid claims and claim expenses, net of reinsurance 137,775 137,783 136,806 135,756 131,136 125,021 117,045 102,402 56,244  
Accident Year 2009 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 392,791 389,526 394,649 402,977 424,951 445,904 478,841 476,417 486,114  
IBNR and ACR 22,783                  
Cumulative paid claims and claim expenses, net of reinsurance 338,523 330,976 325,601 304,564 269,855 242,975 206,138 168,629 $ 40,330  
Accident Year 2010                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 894,050 895,201 886,997 896,219 897,148 927,941 975,846 1,016,922    
IBNR and ACR 76,527                  
Cumulative paid claims and claim expenses, net of reinsurance 764,337 737,478 644,975 572,829 516,321 444,618 325,377 131,436    
Accident Year 2010 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 592,679 590,023 580,084 576,079 555,419 550,608 584,878 632,510    
IBNR and ACR 43,479                  
Cumulative paid claims and claim expenses, net of reinsurance 506,297 496,324 417,446 389,954 352,293 308,198 226,433 96,570    
Accident Year 2010 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 301,371 305,178 306,913 320,140 341,729 377,333 390,968 384,412    
IBNR and ACR 33,048                  
Cumulative paid claims and claim expenses, net of reinsurance 258,040 241,154 227,529 182,875 164,028 136,420 98,944 $ 34,866    
Accident Year 2011                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 1,361,430 1,375,169 1,413,256 1,441,370 1,523,332 1,604,273 1,670,722      
IBNR and ACR 89,094                  
Cumulative paid claims and claim expenses, net of reinsurance 1,230,285 1,202,703 1,158,233 1,067,386 909,176 550,668 259,261      
Accident Year 2011 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 1,063,035 1,066,200 1,098,124 1,118,651 1,170,141 1,221,811 1,286,890      
IBNR and ACR 41,910                  
Cumulative paid claims and claim expenses, net of reinsurance 992,272 978,298 951,725 891,928 763,384 437,082 211,151      
Accident Year 2011 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 298,395 308,969 315,132 322,719 353,191 382,462 383,832      
IBNR and ACR 47,184                  
Cumulative paid claims and claim expenses, net of reinsurance 238,013 224,405 206,508 175,458 145,792 113,586 $ 48,110      
Accident Year 2012                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 658,180 655,602 683,784 710,123 773,367 867,675        
IBNR and ACR 94,086                  
Cumulative paid claims and claim expenses, net of reinsurance 527,153 462,253 418,697 358,789 267,650 166,907        
Accident Year 2012 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 265,058 276,236 294,400 312,216 345,168 438,548        
IBNR and ACR 24,297                  
Cumulative paid claims and claim expenses, net of reinsurance 231,272 219,069 209,059 189,555 145,326 100,067        
Accident Year 2012 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 393,122 379,366 389,384 397,907 428,199 429,127        
IBNR and ACR 69,789                  
Cumulative paid claims and claim expenses, net of reinsurance 295,881 243,184 209,638 169,234 122,324 $ 66,840        
Accident Year 2013                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 450,984 477,294 518,266 564,791 625,081          
IBNR and ACR 86,709                  
Cumulative paid claims and claim expenses, net of reinsurance 330,184 292,542 246,582 181,738 87,837          
Accident Year 2013 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 143,823 155,384 177,533 200,105 230,355          
IBNR and ACR 5,264                  
Cumulative paid claims and claim expenses, net of reinsurance 135,499 131,293 120,117 94,776 49,805          
Accident Year 2013 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 307,161 321,910 340,733 364,686 394,726          
IBNR and ACR 81,445                  
Cumulative paid claims and claim expenses, net of reinsurance 194,685 161,249 126,465 86,962 $ 38,032          
Accident Year 2014                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 586,559 605,648 617,617 664,603            
IBNR and ACR 83,121                  
Cumulative paid claims and claim expenses, net of reinsurance 319,540 270,380 201,873 111,451            
Accident Year 2014 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 143,419 147,610 155,335 184,076            
IBNR and ACR 8,018                  
Cumulative paid claims and claim expenses, net of reinsurance 124,533 119,473 96,667 55,365            
Accident Year 2014 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 443,140 458,038 462,282 480,527            
IBNR and ACR 75,103                  
Cumulative paid claims and claim expenses, net of reinsurance 195,007 150,907 105,206 $ 56,086            
Accident Year 2015                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 634,948 631,559 642,977              
IBNR and ACR 240,331                  
Cumulative paid claims and claim expenses, net of reinsurance 289,630 195,140 96,141              
Accident Year 2015 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 177,296 196,094 227,093              
IBNR and ACR 32,432                  
Cumulative paid claims and claim expenses, net of reinsurance 128,434 109,386 62,358              
Accident Year 2015 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 457,652 435,465 415,884              
IBNR and ACR 207,899                  
Cumulative paid claims and claim expenses, net of reinsurance 161,196 85,754 $ 33,783              
Accident Year 2016                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 691,472 684,960                
IBNR and ACR 358,843                  
Cumulative paid claims and claim expenses, net of reinsurance 219,416 79,943                
Accident Year 2016 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 256,759 254,595                
IBNR and ACR 91,193                  
Cumulative paid claims and claim expenses, net of reinsurance 119,977 47,716                
Accident Year 2016 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 434,713 430,365                
IBNR and ACR 267,650                  
Cumulative paid claims and claim expenses, net of reinsurance 99,439 $ 32,227                
Accident Year 2017                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 1,901,309                  
IBNR and ACR 1,334,903                  
Cumulative paid claims and claim expenses, net of reinsurance 450,886                  
Accident Year 2017 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 1,345,006                  
IBNR and ACR 857,673                  
Cumulative paid claims and claim expenses, net of reinsurance 412,477                  
Accident Year 2017 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 556,303                  
IBNR and ACR 477,230                  
Cumulative paid claims and claim expenses, net of reinsurance $ 38,409