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Reserve For Losses, LAE And Future Policy Benefit Reserve (Ultimate Loss and ALAE And Paid Loss And ALAE, Net Of Reinsurance) (Details) $ in Thousands	Dec. 31, 2021 USD ($) Item	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Claims Development [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	$ 16,785,529
Reinsurance [Member] | Casualty Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	12,499,575
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	5,261,006
All outstanding liabilities prior to 2012, net of reinsurance	824,128
Liabilities for claims and claim adjustment expenses, net of reinsurance	8,062,697
Reinsurance [Member] | Casualty Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	626,752	$ 635,281	$ 656,696	$ 682,447	$ 677,924	$ 676,252	$ 692,497	$ 707,089	$ 806,271	$ 913,235
Total of IBNR Liabilities Plus Expected Development on Reported Claims	22,382
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	568,922	549,564	539,251	504,848	425,397	355,728	275,548	179,993	98,010	41,756
Reinsurance [Member] | Casualty Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	710,499	715,519	715,578	735,487	764,362	794,549	804,255	816,634	726,240
Total of IBNR Liabilities Plus Expected Development on Reported Claims	21,566
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	603,638	574,706	548,578	496,373	389,143	314,826	214,769	123,813	49,581
Reinsurance [Member] | Casualty Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	745,601	747,748	734,567	757,392	798,868	822,646	815,861	776,680
Total of IBNR Liabilities Plus Expected Development on Reported Claims	31,868
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	594,417	553,006	507,146	430,751	304,645	214,072	122,673	57,942
Reinsurance [Member] | Casualty Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	849,230	848,989	812,346	828,634	831,492	836,303	795,662
Total of IBNR Liabilities Plus Expected Development on Reported Claims	75,907
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	621,569	573,637	503,917	413,852	267,841	160,199	57,114
Reinsurance [Member] | Casualty Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	954,364	952,811	877,209	882,087	885,069	808,757
Total of IBNR Liabilities Plus Expected Development on Reported Claims	129,447
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	629,704	548,345	433,583	326,011	190,818	90,184
Reinsurance [Member] | Casualty Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	950,788	942,467	861,180	854,313	894,903
Total of IBNR Liabilities Plus Expected Development on Reported Claims	199,152
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	592,780	464,179	322,029	188,542	81,099
Reinsurance [Member] | Casualty Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,445,481	1,414,891	1,337,894	1,340,402
Total of IBNR Liabilities Plus Expected Development on Reported Claims	466,230
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	638,435	463,099	290,083	154,910
Reinsurance [Member] | Casualty Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,788,763	1,786,629	1,721,440
Total of IBNR Liabilities Plus Expected Development on Reported Claims	907,117
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	526,547	343,081	210,530
Reinsurance [Member] | Casualty Business [Member] | 2020 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,914,757	1,943,096
Total of IBNR Liabilities Plus Expected Development on Reported Claims	1,482,711
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	268,027	190,530
Reinsurance [Member] | Casualty Business [Member] | 2021 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	2,513,341
Total of IBNR Liabilities Plus Expected Development on Reported Claims	1,951,060
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	216,969
Reinsurance [Member] | Property Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	19,028,789
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	14,656,957
All outstanding liabilities prior to 2012, net of reinsurance	519,855
Liabilities for claims and claim adjustment expenses, net of reinsurance	4,891,687
Reinsurance [Member] | Property Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,152,601	1,154,729	1,151,907	1,132,514	1,144,478	1,152,163	1,158,272	1,159,361	1,282,432	1,595,581
Total of IBNR Liabilities Plus Expected Development on Reported Claims	10,597
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,106,461	1,101,861	1,092,694	1,069,836	1,058,690	1,024,725	990,221	896,790	703,440	404,621
Reinsurance [Member] | Property Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	782,285	782,978	784,582	777,334	781,908	787,484	843,829	954,434	1,302,966
Total of IBNR Liabilities Plus Expected Development on Reported Claims	2,615
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	762,225	761,755	760,516	751,190	741,032	720,662	663,255	530,340	384,956
Reinsurance [Member] | Property Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	956,892	956,387	964,131	963,168	963,339	1,055,896	1,207,588	1,366,519
Total of IBNR Liabilities Plus Expected Development on Reported Claims	5,114
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	931,494	928,821	921,984	911,719	882,489	805,888	670,226	378,154
Reinsurance [Member] | Property Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	967,102	965,298	973,022	970,290	996,351	1,072,514	1,408,609
Total of IBNR Liabilities Plus Expected Development on Reported Claims	6,102
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	937,534	926,506	904,827	875,529	787,370	626,200	386,340
Reinsurance [Member] | Property Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,568,689	1,567,764	1,590,207	1,596,178	1,560,324	1,725,574
Total of IBNR Liabilities Plus Expected Development on Reported Claims	19,440
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,539,568	1,520,320	1,460,922	1,336,301	1,035,935	489,865
Reinsurance [Member] | Property Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	3,707,890	3,662,032	3,533,258	3,422,515	2,799,762
Total of IBNR Liabilities Plus Expected Development on Reported Claims	9,592
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	3,477,657	3,259,500	2,858,044	2,277,663	850,375
Reinsurance [Member] | Property Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	2,465,788	2,527,900	2,526,001	2,650,359
Total of IBNR Liabilities Plus Expected Development on Reported Claims	40,866
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	2,125,022	1,941,282	1,563,718	558,319
Reinsurance [Member] | Property Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	2,098,665	2,153,458	2,122,117
Total of IBNR Liabilities Plus Expected Development on Reported Claims	176,930
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,703,956	1,365,923	769,261
Reinsurance [Member] | Property Business [Member] | 2020 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	2,526,034	2,453,269
Total of IBNR Liabilities Plus Expected Development on Reported Claims	616,803
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,385,266	606,518
Reinsurance [Member] | Property Business [Member] | 2021 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	2,802,843
Total of IBNR Liabilities Plus Expected Development on Reported Claims	1,445,812
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	687,773
Insurance [Member] | Casualty Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	6,663,437
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	3,505,299
All outstanding liabilities prior to 2012, net of reinsurance	226,081
Liabilities for claims and claim adjustment expenses, net of reinsurance	3,384,219
Insurance [Member] | Casualty Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	354,697	353,942	351,441	346,980	344,007	353,394	348,260	347,065	351,526	349,721
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 31,942
Cumulative Number of Reported Claims | Item	15,782
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 317,249	311,863	306,934	294,442	272,113	246,454	213,488	157,924	101,300	33,194
Insurance [Member] | Casualty Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	350,107	349,965	350,927	344,479	351,380	393,129	392,955	393,519	393,689
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 29,280
Cumulative Number of Reported Claims | Item	21,360
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 317,111	310,927	303,784	285,872	260,222	224,633	176,326	117,046	33,314
Insurance [Member] | Casualty Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	397,889	399,021	398,126	397,307	460,862	454,801	457,270	431,297
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 44,649
Cumulative Number of Reported Claims | Item	25,265
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 350,976	339,484	326,008	297,760	256,885	201,688	124,936	41,194
Insurance [Member] | Casualty Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	472,700	472,079	469,081	542,637	536,106	528,468	519,869
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 56,840
Cumulative Number of Reported Claims | Item	27,044
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 414,069	382,743	353,440	292,111	218,987	134,760	44,317
Insurance [Member] | Casualty Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	542,750	554,151	616,641	581,114	552,057	554,134
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 86,737
Cumulative Number of Reported Claims | Item	31,674
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 445,429	402,518	342,880	269,127	164,357	54,740
Insurance [Member] | Casualty Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	635,622	659,359	627,426	604,615	614,528
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 156,575
Cumulative Number of Reported Claims | Item	35,627
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 457,197	381,169	281,339	172,415	53,918
Insurance [Member] | Casualty Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	766,992	752,894	714,065	708,122
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 193,686
Cumulative Number of Reported Claims | Item	36,041
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 447,358	319,559	208,432	63,587
Insurance [Member] | Casualty Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	888,280	855,266	852,407
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 288,688
Cumulative Number of Reported Claims | Item	39,219
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 398,600	234,915	72,394
Insurance [Member] | Casualty Business [Member] | 2020 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,058,272	997,126
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 620,239
Cumulative Number of Reported Claims | Item	34,983
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 248,000	79,658
Insurance [Member] | Casualty Business [Member] | 2021 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,196,128
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 782,844
Cumulative Number of Reported Claims | Item	31,679
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 109,311
Insurance [Member] | Property Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	3,155,364
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	2,708,995
All outstanding liabilities prior to 2012, net of reinsurance	557
Liabilities for claims and claim adjustment expenses, net of reinsurance	446,926
Insurance [Member] | Property Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	82,685	82,613	82,552	82,005	81,828	82,045	82,475	81,773	89,038	106,363
Total of IBNR Liabilities Plus Expected Development on Reported Claims	5
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	82,669	82,612	82,483	81,846	81,708	81,917	81,776	80,495	81,798	$ 56,506
Insurance [Member] | Property Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	92,035	91,893	92,326	92,472	92,311	92,222	91,334	98,203	112,082
Total of IBNR Liabilities Plus Expected Development on Reported Claims	94
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	91,942	91,864	91,855	91,838	91,798	92,189	91,919	93,179	$ 68,711
Insurance [Member] | Property Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	119,428	119,138	119,481	119,344	119,523	119,989	123,744	131,752
Total of IBNR Liabilities Plus Expected Development on Reported Claims	49
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	118,808	118,799	118,724	118,605	118,270	118,277	116,089	$ 81,853
Insurance [Member] | Property Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	146,559	146,626	144,919	146,930	144,081	153,028	173,059
Total of IBNR Liabilities Plus Expected Development on Reported Claims	47
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	147,052	146,954	146,866	145,367	142,560	141,394	$ 102,239
Insurance [Member] | Property Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	297,417	295,140	292,750	280,797	275,740	291,182
Total of IBNR Liabilities Plus Expected Development on Reported Claims	380
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	294,031	293,247	290,278	272,535	250,034	$ 162,906
Insurance [Member] | Property Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	493,370	499,323	496,195	502,601	498,044
Total of IBNR Liabilities Plus Expected Development on Reported Claims	480
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	486,538	482,817	460,130	425,384	$ 179,403
Insurance [Member] | Property Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	411,160	398,243	403,013	409,168
Total of IBNR Liabilities Plus Expected Development on Reported Claims	693
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	404,819	379,654	359,276	$ 245,840
Insurance [Member] | Property Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	355,692	351,599	349,061
Total of IBNR Liabilities Plus Expected Development on Reported Claims	5,808
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	339,411	317,766	$ 227,630
Insurance [Member] | Property Business [Member] | 2020 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	507,281	599,613
Total of IBNR Liabilities Plus Expected Development on Reported Claims	45,162
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	415,518	$ 293,331
Insurance [Member] | Property Business [Member] | 2021 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	649,738
Total of IBNR Liabilities Plus Expected Development on Reported Claims	191,897
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 328,207

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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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Cumulative number of reported claims for short-duration insurance contracts.

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