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Reserve for Claims and Claim Expenses (Schedule of Incurred and Paid Claims Development) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	$ 17,106,243
IBNR and ACR	5,240,331
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	9,996,625
Outstanding liabilities from accident year 2010 and prior, net of reinsurance	365,294
Claims and claim expenses, net of reinsurance, from the Company's former Bermuda-based insurance operations	508
Adjustment for unallocated loss adjustment expenses	57,538
Unamortized fair value adjustments recorded in connection with acquisitions	(77,830)
Liability for claims and claim expenses, net of reinsurance	7,455,128
Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	7,881,758
IBNR and ACR	2,188,508
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	5,060,973
Outstanding liabilities from accident year 2010 and prior, net of reinsurance	113,550
Adjustment for unallocated loss adjustment expenses	13,717
Unamortized fair value adjustments recorded in connection with acquisitions	(11,795)
Liability for claims and claim expenses, net of reinsurance	2,936,257
Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	9,224,485
IBNR and ACR	3,051,823
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	4,935,652
Outstanding liabilities from accident year 2010 and prior, net of reinsurance	251,744
Adjustment for unallocated loss adjustment expenses	43,821
Unamortized fair value adjustments recorded in connection with acquisitions	(66,035)
Liability for claims and claim expenses, net of reinsurance	4,518,363
Accident Year 2011
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,739,044	$ 1,741,868	$ 1,753,974	$ 1,760,870	$ 1,775,879	$ 1,814,478	$ 1,845,827	$ 1,905,502	$ 2,003,446	$ 2,057,531
IBNR and ACR	42,682
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	1,654,513	1,642,690	1,626,868	1,606,091	1,566,774	1,521,666	1,398,853	1,204,812	766,658	370,083
Accident Year 2011 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,380,673	1,379,645	1,398,038	1,412,109	1,415,459	1,446,398	1,470,521	1,501,089	1,571,670	1,628,699
IBNR and ACR	23,635
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	1,346,335	1,339,798	1,332,319	1,326,439	1,303,092	1,278,942	1,188,978	1,025,947	627,932	305,318
Accident Year 2011 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	358,371	362,223	355,936	348,761	360,420	368,080	375,306	404,413	431,776	428,832
IBNR and ACR	19,047
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	308,178	302,892	294,549	279,652	263,682	242,724	209,875	178,865	138,726	$ 64,765
Accident Year 2012
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	900,001	916,065	910,998	904,408	902,432	930,761	962,397	1,026,595	1,142,390
IBNR and ACR	33,600
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	798,486	789,281	758,265	726,192	651,403	599,696	525,208	419,242	268,952
Accident Year 2012 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	327,407	335,699	340,218	348,108	359,890	376,811	397,075	431,482	562,094
IBNR and ACR	3,286
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	317,291	316,691	311,179	307,845	293,008	281,594	254,924	206,440	166,143
Accident Year 2012 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	572,594	580,366	570,780	556,300	542,542	553,950	565,322	595,113	580,296
IBNR and ACR	30,314
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	481,195	472,590	447,086	418,347	358,395	318,102	270,284	212,802	$ 102,809
Accident Year 2013
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	736,657	738,973	755,412	774,095	798,648	845,473	896,904	921,455
IBNR and ACR	22,627
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	645,255	625,156	596,950	562,764	503,603	440,266	345,709	133,356
Accident Year 2013 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	246,855	240,252	240,007	243,839	255,322	277,641	300,349	323,743
IBNR and ACR	1,177
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	232,882	227,412	223,822	220,333	212,431	196,171	158,689	81,344
Accident Year 2013 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	489,802	498,721	515,405	530,256	543,326	567,832	596,555	597,712
IBNR and ACR	21,450
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	412,373	397,744	373,128	342,431	291,172	244,095	187,020	$ 52,012
Accident Year 2014
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	892,597	926,802	929,248	948,224	972,429	982,016	1,010,256
IBNR and ACR	62,812
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	777,240	747,069	699,620	637,889	561,274	438,641	231,666
Accident Year 2014 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	250,617	258,791	261,522	262,696	267,795	281,496	305,033
IBNR and ACR	1,442
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	247,165	247,578	243,862	236,789	224,960	185,934	107,075
Accident Year 2014 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	641,980	668,011	667,726	685,528	704,634	700,520	705,223
IBNR and ACR	61,370
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	530,075	499,491	455,758	401,100	336,314	252,707	$ 124,591
Accident Year 2015
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,145,196	1,132,034	1,136,753	1,167,569	1,151,413	1,146,737
IBNR and ACR	111,924
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	948,787	877,359	780,987	664,213	499,116	263,046
Accident Year 2015 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	310,317	314,389	325,719	336,705	359,662	375,399
IBNR and ACR	5,495
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	297,004	293,140	282,362	262,702	228,285	127,314
Accident Year 2015 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	834,879	817,645	811,034	830,864	791,751	771,338
IBNR and ACR	106,429
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	651,783	584,219	498,625	401,511	270,831	$ 135,732
Accident Year 2016
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,403,513	1,454,217	1,457,825	1,475,540	1,429,056
IBNR and ACR	136,821
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	1,089,800	978,676	837,022	629,894	288,221
Accident Year 2016 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	419,308	438,040	457,052	473,708	460,422
IBNR and ACR	18,718
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	374,565	354,088	329,543	260,902	120,478
Accident Year 2016 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	984,205	1,016,177	1,000,773	1,001,832	968,634
IBNR and ACR	118,103
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	715,235	624,588	507,479	368,992	$ 167,743
Accident Year 2017
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	2,685,050	2,691,020	2,761,844	2,966,271
IBNR and ACR	543,257
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	1,732,228	1,377,696	1,077,845	748,714
Accident Year 2017 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,364,285	1,360,897	1,467,835	1,649,071
IBNR and ACR	276,858
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	958,207	823,683	665,330	534,752
Accident Year 2017 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,320,765	1,330,123	1,294,009	1,317,200
IBNR and ACR	266,399
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	774,021	554,013	412,515	$ 213,962
Accident Year 2018
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	2,394,667	2,380,979	2,225,968
IBNR and ACR	656,507
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	1,257,609	819,173	589,357
Accident Year 2018 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,051,617	1,062,871	957,622
IBNR and ACR	183,781
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	667,336	454,553	432,075
Accident Year 2018 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,343,050	1,318,108	1,268,346
IBNR and ACR	472,726
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	590,273	364,620	$ 157,282
Accident Year 2019
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	2,229,128	2,234,727
IBNR and ACR	1,167,735
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	701,982	288,435
Accident Year 2019 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	978,600	1,014,100
IBNR and ACR	427,179
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	377,564	160,915
Accident Year 2019 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,250,528	1,220,627
IBNR and ACR	740,556
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	324,418	$ 127,520
Accident Year 2020
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	2,980,390
IBNR and ACR	2,462,366
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	390,725
Accident Year 2020 | Property
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,552,079
IBNR and ACR	1,246,937
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	242,624
Accident Year 2020 | Casualty and Specialty
Claims Development [Line Items]
Incurred Claims and Claim Expenses, Net of Reinsurance	1,428,311
IBNR and ACR	1,215,429
Cumulative Paid Claims and Claim Expenses, Net of Reinsurance	$ 148,101

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Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Unamortized Fair Value Adjustments Associated With Acquisition

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Amount, after reinsurance, of paid claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of incurred claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts for accident years not separately presented in claim development information. Excludes unallocated claim adjustment expense.

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Amount of reconciling item for the reconciliation of the liability in the disclosure of claims development (in excess of) less than the liability for unpaid claims and claims adjustment expense for short-duration insurance contracts, classified as other.

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