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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, 2020 USD ($) Item	Dec. 31, 2019 USD ($)	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	$ 14,322,754
Reinsurance [Member] | Casualty Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	10,095,859
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	4,322,265
All outstanding liabilities prior to 2012, net of reinsurance	940,597
Liabilities for claims and claim adjustment expenses, net of reinsurance	6,714,191
Reinsurance [Member] | Casualty Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	641,893	$ 663,308	$ 689,068	$ 684,537	$ 682,333	$ 698,212	$ 712,407	$ 811,282	$ 917,560
Total of IBNR Liabilities Plus Expected Development on Reported Claims	43,700
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	555,736	543,688	509,020	429,165	358,953	278,492	182,550	99,763	42,576
Reinsurance [Member] | Casualty Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	721,902	721,961	741,873	770,745	800,451	809,631	821,395	730,202
Total of IBNR Liabilities Plus Expected Development on Reported Claims	56,597
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	579,350	552,824	500,316	392,503	317,744	217,243	125,739	50,506
Reinsurance [Member] | Casualty Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	753,967	740,786	763,611	805,087	828,341	820,870	780,730
Total of IBNR Liabilities Plus Expected Development on Reported Claims	72,825
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	557,209	511,143	434,450	307,587	216,441	124,433	58,833
Reinsurance [Member] | Casualty Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	858,157	821,513	837,802	840,659	845,303	805,551
Total of IBNR Liabilities Plus Expected Development on Reported Claims	113,144
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	581,942	511,414	421,223	273,896	165,005	58,406
Reinsurance [Member] | Casualty Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	963,300	887,698	892,576	895,558	818,293
Total of IBNR Liabilities Plus Expected Development on Reported Claims	195,650
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	558,379	441,325	333,163	196,746	94,154
Reinsurance [Member] | Casualty Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	951,461	870,174	863,306	903,896
Total of IBNR Liabilities Plus Expected Development on Reported Claims	319,560
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	475,472	327,625	192,547	83,286
Reinsurance [Member] | Casualty Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,431,276	1,354,279	1,356,788
Total of IBNR Liabilities Plus Expected Development on Reported Claims	639,205
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	465,181	299,369	159,215
Reinsurance [Member] | Casualty Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,810,434	1,740,245
Total of IBNR Liabilities Plus Expected Development on Reported Claims	1,118,428
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	354,292	219,229
Reinsurance [Member] | Casualty Business [Member] | 2020 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,963,469
Total of IBNR Liabilities Plus Expected Development on Reported Claims	1,497,536
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	194,704
Reinsurance [Member] | Property Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	16,439,082
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	12,205,119
All outstanding liabilities prior to 2012, net of reinsurance	105,209
Liabilities for claims and claim adjustment expenses, net of reinsurance	4,339,172
Reinsurance [Member] | Property Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,184,476	1,181,653	1,162,252	1,174,224	1,181,200	1,187,096	1,188,304	1,311,752	1,625,024
Total of IBNR Liabilities Plus Expected Development on Reported Claims	7,419
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,126,302	1,120,273	1,098,004	1,086,813	1,051,968	1,016,689	896,372	723,394	417,397
Reinsurance [Member] | Property Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	797,047	798,652	791,400	795,978	801,457	857,241	969,175	1,326,814
Total of IBNR Liabilities Plus Expected Development on Reported Claims	1,722
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	770,215	768,490	759,925	749,345	728,570	670,369	567,616	394,228
Reinsurance [Member] | Property Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	980,449	988,193	987,230	987,401	1,080,269	1,230,656	1,388,249
Total of IBNR Liabilities Plus Expected Development on Reported Claims	3,325
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	937,437	931,451	921,183	889,561	812,441	678,897	388,263
Reinsurance [Member] | Property Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	983,478	991,202	988,469	1,014,531	1,090,474	1,420,523
Total of IBNR Liabilities Plus Expected Development on Reported Claims	2,384
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	926,388	905,281	876,356	792,018	633,428	390,284
Reinsurance [Member] | Property Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,564,702	1,587,145	1,593,116	1,557,262	1,730,936
Total of IBNR Liabilities Plus Expected Development on Reported Claims	20,676
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,447,824	1,394,284	1,269,622	986,043	480,453
Reinsurance [Member] | Property Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	3,687,487	3,558,713	3,447,971	2,825,218
Total of IBNR Liabilities Plus Expected Development on Reported Claims	28,865
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	3,161,267	2,775,818	2,207,048	835,042
Reinsurance [Member] | Property Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	2,561,852	2,559,953	2,684,311
Total of IBNR Liabilities Plus Expected Development on Reported Claims	121,379
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,969,117	1,579,781	576,573
Reinsurance [Member] | Property Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	2,192,239	2,165,898
Total of IBNR Liabilities Plus Expected Development on Reported Claims	434,700
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,250,409	770,686
Reinsurance [Member] | Property Business [Member] | 2020 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	2,487,352
Total of IBNR Liabilities Plus Expected Development on Reported Claims	1,341,994
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	616,160
Insurance [Member] | Casualty Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	5,391,340
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	2,747,987
All outstanding liabilities prior to 2012, net of reinsurance	224,752
Liabilities for claims and claim adjustment expenses, net of reinsurance	2,868,104
Insurance [Member] | Casualty Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	353,945	351,444	346,983	344,008	353,395	348,262	347,068	351,529	349,724
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 11,283
Cumulative Number of Reported Claims | Item	15,780
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 311,865	306,937	294,444	272,114	246,455	213,488	157,924	101,301	33,194
Insurance [Member] | Casualty Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	349,985	350,947	344,498	351,399	393,148	392,976	393,539	393,710
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 20,093
Cumulative Number of Reported Claims | Item	21,385
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 310,928	303,786	285,873	260,223	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	399,048	398,153	397,334	460,888	454,827	457,296	431,323
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 38,361
Cumulative Number of Reported Claims | Item	25,221
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 339,487	326,011	297,762	256,886	201,689	124,937	41,194
Insurance [Member] | Casualty Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	472,125	469,132	542,687	536,155	528,517	519,917
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 80,007
Cumulative Number of Reported Claims | Item	26,996
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 382,748	353,445	292,115	218,990	134,761	44,317
Insurance [Member] | Casualty Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	554,621	617,051	581,273	552,192	554,253
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 138,312
Cumulative Number of Reported Claims | Item	31,673
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 402,693	343,020	269,163	164,384	54,740
Insurance [Member] | Casualty Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	660,114	628,149	605,062	614,949
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 180,513
Cumulative Number of Reported Claims | Item	35,020
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 381,442	281,500	172,476	53,922
Insurance [Member] | Casualty Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	754,053	715,008	708,808
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 275,213
Cumulative Number of Reported Claims | Item	34,884
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 319,858	208,531	63,614
Insurance [Member] | Casualty Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	856,466	852,767
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 444,603
Cumulative Number of Reported Claims | Item	37,597
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 235,087	72,399
Insurance [Member] | Casualty Business [Member] | 2020 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	990,982
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 649,288
Cumulative Number of Reported Claims | Item	26,068
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 63,878
Insurance [Member] | Property Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	2,609,287
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	2,208,038
All outstanding liabilities prior to 2012, net of reinsurance	39
Liabilities for claims and claim adjustment expenses, net of reinsurance	401,287
Insurance [Member] | Property Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	82,614	82,553	82,006	81,828	82,045	82,476	81,774	89,039	106,364
Total of IBNR Liabilities Plus Expected Development on Reported Claims	1
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	82,613	82,483	81,847	81,708	81,918	81,777	80,496	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	91,895	92,328	92,473	92,313	92,224	91,336	98,206	112,083
Total of IBNR Liabilities Plus Expected Development on Reported Claims	29
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	91,866	91,857	91,840	91,800	92,191	91,921	93,181	$ 68,712
Insurance [Member] | Property Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	119,139	119,483	119,346	119,525	119,991	123,745	131,754
Total of IBNR Liabilities Plus Expected Development on Reported Claims	57
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	118,801	118,726	118,606	118,271	118,278	116,090	$ 81,853
Insurance [Member] | Property Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	146,630	144,923	146,934	144,084	153,031	173,062
Total of IBNR Liabilities Plus Expected Development on Reported Claims	286
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	146,958	146,870	145,371	142,563	141,396	$ 102,241
Insurance [Member] | Property Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	295,364	292,986	280,872	275,812	291,370
Total of IBNR Liabilities Plus Expected Development on Reported Claims	308
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	293,457	290,476	272,583	250,073	$ 162,916
Insurance [Member] | Property Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	499,724	496,583	502,935	498,359
Total of IBNR Liabilities Plus Expected Development on Reported Claims	6,358
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	483,178	460,412	425,607	$ 179,432
Insurance [Member] | Property Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	398,616	403,294	409,527
Total of IBNR Liabilities Plus Expected Development on Reported Claims	5,436
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	379,937	359,452	$ 245,944
Insurance [Member] | Property Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	352,038	349,177
Total of IBNR Liabilities Plus Expected Development on Reported Claims	14,100
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	317,960	$ 227,639
Insurance [Member] | Property Business [Member] | 2020 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	623,267
Total of IBNR Liabilities Plus Expected Development on Reported Claims	255,707
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 293,269

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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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