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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) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Claims Development [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	$ 11,768,596
United States Reinsurance [Member] | Casualty Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	3,281,926
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,692,901
All outstanding liabilities prior to 2012, net of reinsurance	607,385
Liabilities for claims and claim adjustment expenses, net of reinsurance	2,196,410
United States Reinsurance [Member] | Casualty Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	312,483	$ 324,139	$ 320,958	$ 321,099	$ 325,134	$ 329,084	$ 395,794	$ 401,018
Total of IBNR Liabilities Plus Expected Development on Reported Claims	1,539
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	286,409	272,046	218,653	187,286	143,510	82,995	38,496	9,986
United States Reinsurance [Member] | Casualty Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	355,118	362,781	372,409	388,287	385,643	388,323	310,935
Total of IBNR Liabilities Plus Expected Development on Reported Claims	3,851
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	310,168	285,756	211,273	170,868	108,801	48,929	14,842
United States Reinsurance [Member] | Casualty Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	351,033	357,608	375,404	392,379	383,657	367,492
Total of IBNR Liabilities Plus Expected Development on Reported Claims	2,232
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	294,533	254,077	164,552	110,249	54,255	18,809
United States Reinsurance [Member] | Casualty Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	337,332	350,790	352,983	354,265	326,346
Total of IBNR Liabilities Plus Expected Development on Reported Claims	10,184
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	257,511	206,397	107,458	53,621	19,902
United States Reinsurance [Member] | Casualty Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	343,004	355,804	354,822	330,362
Total of IBNR Liabilities Plus Expected Development on Reported Claims	56,353
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	193,804	137,219	58,310	18,927
United States Reinsurance [Member] | Casualty Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	342,896	347,147	346,836
Total of IBNR Liabilities Plus Expected Development on Reported Claims	105,550
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	142,335	73,023	25,800
United States Reinsurance [Member] | Casualty Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	472,532	484,218
Total of IBNR Liabilities Plus Expected Development on Reported Claims	259,800
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	104,690	63,140
United States Reinsurance [Member] | Casualty Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	767,529
Total of IBNR Liabilities Plus Expected Development on Reported Claims	488,182
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	103,453
United States Reinsurance [Member] | Property Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	7,421,556
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	5,878,758
All outstanding liabilities prior to 2012, net of reinsurance	29,929
Liabilities for claims and claim adjustment expenses, net of reinsurance	1,572,727
United States Reinsurance [Member] | Property Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	694,576	692,079	706,782	713,237	715,961	723,151	723,851	937,720
Total of IBNR Liabilities Plus Expected Development on Reported Claims	1,112
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	666,768	651,550	646,572	621,013	598,289	520,244	402,305	242,315
United States Reinsurance [Member] | Property Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	310,199	308,557	310,942	314,637	352,687	405,338	622,108
Total of IBNR Liabilities Plus Expected Development on Reported Claims	1,099
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	302,756	300,708	296,074	289,130	269,014	250,850	234,464
United States Reinsurance [Member] | Property Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	397,683	396,641	402,129	437,409	516,189	603,258
Total of IBNR Liabilities Plus Expected Development on Reported Claims	2,674
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	375,988	373,060	362,825	338,030	289,430	189,598
United States Reinsurance [Member] | Property Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	456,195	451,694	476,348	534,178	673,913
Total of IBNR Liabilities Plus Expected Development on Reported Claims	5,655
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	419,757	405,614	378,235	320,310	225,655
United States Reinsurance [Member] | Property Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	788,551	797,339	816,765	972,881
Total of IBNR Liabilities Plus Expected Development on Reported Claims	10,293
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	735,678	681,502	582,985	291,462
United States Reinsurance [Member] | Property Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	2,231,384	2,117,747	1,564,165
Total of IBNR Liabilities Plus Expected Development on Reported Claims	16,538
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,744,822	1,422,328	545,551
United States Reinsurance [Member] | Property Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,572,138	1,728,705
Total of IBNR Liabilities Plus Expected Development on Reported Claims	88,063
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,064,431	409,225
United States Reinsurance [Member] | Property Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	970,831
Total of IBNR Liabilities Plus Expected Development on Reported Claims	329,576
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	568,556
International [Member] | Casualty Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,496,922
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	694,615
All outstanding liabilities prior to 2012, net of reinsurance	116,104
Liabilities for claims and claim adjustment expenses, net of reinsurance	918,411
International [Member] | Casualty Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	101,872	116,283	118,941	117,350	135,230	135,234	146,421	224,614
Total of IBNR Liabilities Plus Expected Development on Reported Claims	6,225
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	88,278	83,253	76,921	66,234	56,420	46,015	30,090	18,875
International [Member] | Casualty Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	130,124	138,355	141,645	144,869	164,973	168,277	184,497
Total of IBNR Liabilities Plus Expected Development on Reported Claims	13,641
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	95,799	86,851	75,964	67,605	54,619	41,481	17,865
International [Member] | Casualty Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	158,117	166,605	166,576	168,865	187,451	195,753
Total of IBNR Liabilities Plus Expected Development on Reported Claims	27,302
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	99,522	86,607	73,955	62,508	44,805	25,910
International [Member] | Casualty Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	167,290	172,061	172,811	179,392	193,714
Total of IBNR Liabilities Plus Expected Development on Reported Claims	30,299
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	96,180	82,465	69,674	48,806	24,237
International [Member] | Casualty Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	178,255	177,979	180,284	184,267
Total of IBNR Liabilities Plus Expected Development on Reported Claims	46,648
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	87,191	70,108	50,824	26,446
International [Member] | Casualty Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	150,276	139,214	191,492
Total of IBNR Liabilities Plus Expected Development on Reported Claims	48,308
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	77,614	52,774	26,541
International [Member] | Casualty Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	319,752	309,673
Total of IBNR Liabilities Plus Expected Development on Reported Claims	148,582
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	97,222	57,962
International [Member] | Casualty Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	291,237
Total of IBNR Liabilities Plus Expected Development on Reported Claims	189,506
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	52,808
International [Member] | Property Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	4,581,301
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	3,209,811
All outstanding liabilities prior to 2012, net of reinsurance	54,040
Liabilities for claims and claim adjustment expenses, net of reinsurance	1,425,530
International [Member] | Property Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	358,428	344,626	340,618	342,251	346,116	338,496	397,747	437,946
Total of IBNR Liabilities Plus Expected Development on Reported Claims	754
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	355,887	324,936	319,112	311,706	303,002	279,611	230,203	126,001
International [Member] | Property Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	369,876	362,370	365,106	366,182	374,216	413,959	473,767
Total of IBNR Liabilities Plus Expected Development on Reported Claims	920
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	354,102	341,831	337,087	325,155	294,024	246,893	121,461
International [Member] | Property Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	446,412	445,914	443,210	497,317	541,484	589,489
Total of IBNR Liabilities Plus Expected Development on Reported Claims	3,613
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	416,735	410,715	392,731	360,679	295,731	162,647
International [Member] | Property Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	385,980	384,816	388,795	393,027	545,360
Total of IBNR Liabilities Plus Expected Development on Reported Claims	4,466
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	345,693	334,271	299,773	235,921	127,511
International [Member] | Property Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	595,512	593,567	543,428	539,447
Total of IBNR Liabilities Plus Expected Development on Reported Claims	15,930
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	481,029	447,094	316,190	159,425
International [Member] | Property Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	970,874	954,835	857,100
Total of IBNR Liabilities Plus Expected Development on Reported Claims	15,997
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	773,790	641,832	247,895
International [Member] | Property Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	574,521	544,258
Total of IBNR Liabilities Plus Expected Development on Reported Claims	84,717
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	330,681	90,429
International [Member] | Property Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	879,698
Total of IBNR Liabilities Plus Expected Development on Reported Claims	389,242
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	151,893
Bermuda Segment [Member] | Casualty Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	2,945,212
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	991,242
All outstanding liabilities prior to 2012, net of reinsurance	356,351
Liabilities for claims and claim adjustment expenses, net of reinsurance	2,310,321
Bermuda Segment [Member] | Casualty Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	241,631	241,312	237,315	236,883	230,441	240,949	262,122	284,509
Total of IBNR Liabilities Plus Expected Development on Reported Claims	30,273
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	164,775	149,629	130,159	102,019	75,680	51,278	29,660	12,864
Bermuda Segment [Member] | Casualty Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	230,654	234,668	250,627	261,259	252,704	258,432	228,258
Total of IBNR Liabilities Plus Expected Development on Reported Claims	33,689
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	144,010	124,708	102,866	77,270	52,270	33,951	16,996
Bermuda Segment [Member] | Casualty Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	226,434	234,196	257,904	261,523	244,163	211,439
Total of IBNR Liabilities Plus Expected Development on Reported Claims	48,168
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	115,098	91,981	67,716	42,872	24,915	13,580
Bermuda Segment [Member] | Casualty Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	309,983	308,042	307,957	301,791	273,468
Total of IBNR Liabilities Plus Expected Development on Reported Claims	82,925
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	153,080	127,930	93,220	58,956	13,643
Bermuda Segment [Member] | Casualty Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	357,169	349,522	351,182	292,353
Total of IBNR Liabilities Plus Expected Development on Reported Claims	114,651
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	155,397	121,553	84,152	45,671
Bermuda Segment [Member] | Casualty Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	365,823	365,767	354,391
Total of IBNR Liabilities Plus Expected Development on Reported Claims	181,139
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	103,915	64,197	29,904
Bermuda Segment [Member] | Casualty Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	546,367	547,267
Total of IBNR Liabilities Plus Expected Development on Reported Claims	376,744
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	93,727	36,678
Bermuda Segment [Member] | Casualty Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	667,150
Total of IBNR Liabilities Plus Expected Development on Reported Claims	551,529
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	61,239
Bermuda Segment [Member] | Property Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,787,971
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,150,003
All outstanding liabilities prior to 2012, net of reinsurance	26,236
Liabilities for claims and claim adjustment expenses, net of reinsurance	664,204
Bermuda Segment [Member] | Property Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	120,824	117,734	118,999	117,909	117,221	119,168	180,775	238,152
Total of IBNR Liabilities Plus Expected Development on Reported Claims	593
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	116,429	113,816	113,508	111,772	108,172	90,147	85,175	45,573
Bermuda Segment [Member] | Property Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	112,900	114,800	114,252	115,029	124,191	142,666	217,531
Total of IBNR Liabilities Plus Expected Development on Reported Claims	272
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	111,833	111,655	110,378	108,535	101,614	64,560	34,745
Bermuda Segment [Member] | Property Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	136,813	137,389	134,776	138,381	164,139	186,492
Total of IBNR Liabilities Plus Expected Development on Reported Claims	1,092
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	131,455	129,891	126,552	106,564	86,611	32,813
Bermuda Segment [Member] | Property Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	143,266	146,196	143,625	157,711	192,520
Total of IBNR Liabilities Plus Expected Development on Reported Claims	2,204
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	134,862	131,387	109,401	73,041	33,814
Bermuda Segment [Member] | Property Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	187,607	186,735	181,593	206,279
Total of IBNR Liabilities Plus Expected Development on Reported Claims	4,619
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	167,562	130,319	78,499	26,737
Bermuda Segment [Member] | Property Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	346,472	365,405	393,969
Total of IBNR Liabilities Plus Expected Development on Reported Claims	10,115
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	250,661	137,127	38,106
Bermuda Segment [Member] | Property Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	396,488	394,542
Total of IBNR Liabilities Plus Expected Development on Reported Claims	85,786
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	170,831	72,580
Bermuda Segment [Member] | Property Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	343,602
Total of IBNR Liabilities Plus Expected Development on Reported Claims	184,640
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	66,370
Insurance [Member] | Casualty Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	4,370,593
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	2,193,224
All outstanding liabilities prior to 2012, net of reinsurance	300,347
Liabilities for claims and claim adjustment expenses, net of reinsurance	2,477,716
Insurance [Member] | Casualty Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	351,320	346,882	343,931	353,320	348,180	346,953	351,402	349,597
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 20,199
Cumulative Number of Reported Claims	15,769
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 306,833	294,380	272,055	246,407	213,451	157,897	101,288	33,185
Insurance [Member] | Casualty Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	350,815	344,388	351,295	393,035	392,827	393,390	393,539
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 23,120
Cumulative Number of Reported Claims	21,350
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 303,726	285,822	260,184	224,611	176,312	117,037	33,311
Insurance [Member] | Casualty Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	397,834	397,061	460,642	454,576	457,043	431,068
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 38,872
Cumulative Number of Reported Claims	25,188
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 325,856	297,644	256,807	201,646	124,915	41,190
Insurance [Member] | Casualty Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	468,584	542,176	535,671	528,050	519,509
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 54,740
Cumulative Number of Reported Claims	26,896
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 353,232	291,943	218,853	134,730	44,311
Insurance [Member] | Casualty Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	615,168	580,323	551,321	553,437
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 166,117
Cumulative Number of Reported Claims	31,517
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 342,325	268,909	164,225	54,731
Insurance [Member] | Casualty Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	625,039	602,985	612,967
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 226,898
Cumulative Number of Reported Claims	34,701
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 280,797	172,200	53,898
Insurance [Member] | Casualty Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	711,001	705,789
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 353,806
Cumulative Number of Reported Claims	33,817
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 208,081	63,492
Insurance [Member] | Casualty Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	850,832
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 653,255
Cumulative Number of Reported Claims	30,144
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 72,375
Insurance [Member] | Property Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,975,961
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,773,329
All outstanding liabilities prior to 2012, net of reinsurance	644
Liabilities for claims and claim adjustment expenses, net of reinsurance	203,277
Insurance [Member] | Property Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	82,526	81,979	81,802	82,019	82,448	81,747	89,000	106,325
Total of IBNR Liabilities Plus Expected Development on Reported Claims	68
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	82,457	81,820	81,682	81,891	81,749	80,469	81,772	$ 56,504
Insurance [Member] | Property Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	92,246	92,393	92,233	92,144	91,251	98,106	112,037
Total of IBNR Liabilities Plus Expected Development on Reported Claims	471
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	91,777	91,759	91,720	92,110	91,841	93,110	$ 68,695
Insurance [Member] | Property Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	119,413	119,282	119,464	119,928	123,668	131,679
Total of IBNR Liabilities Plus Expected Development on Reported Claims	407
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	118,660	118,545	118,211	118,220	116,037	$ 81,827
Insurance [Member] | Property Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	144,769	146,780	143,944	152,895	172,904
Total of IBNR Liabilities Plus Expected Development on Reported Claims	405
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	146,719	145,225	142,437	141,280	$ 102,170
Insurance [Member] | Property Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	291,672	280,170	275,154	290,264
Total of IBNR Liabilities Plus Expected Development on Reported Claims	736
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	289,194	271,938	249,517	$ 162,548
Insurance [Member] | Property Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	494,844	501,407	496,905
Total of IBNR Liabilities Plus Expected Development on Reported Claims	13,043
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	458,811	424,181	$ 178,666
Insurance [Member] | Property Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	401,900	407,855
Total of IBNR Liabilities Plus Expected Development on Reported Claims	14,862
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	358,324	$ 244,772
Insurance [Member] | Property Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	348,590
Total of IBNR Liabilities Plus Expected Development on Reported Claims	81,655
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 227,387

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