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Other Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended						6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	$ 11,378	$ (39,477)	$ (59,993)	$ 8,910	$ 9,633	$ (7,426)	$ (99,470)	$ 2,207	$ (88,092)	$ 11,117	$ 331,223	$ 63,340
NET INCOME (LOSS)	104,398	$ 332,868	$ 354,551	198,381	$ 60,787	$ 215,186	$ 687,419	$ 275,973	791,817	474,354	$ 89,041	$ 482,751
URA(D) On Securities [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other net realized capital gains (losses)	(74)			2,175					(3,597)	(7,800)
Income tax expense (benefit)	(455)			(758)					(623)	694
NET INCOME (LOSS)	(529)			1,417					(4,220)	(7,106)
Benefit Plan Net Actuarial Gain (Loss) [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other underwriting expenses	1,726			2,298					4,640	6,893
Income tax expense (benefit)	(363)			(482)					(975)	(1,447)
NET INCOME (LOSS)	$ 1,363			$ 1,816					$ 3,665	$ 5,446

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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