Income Taxes (Components Of Domestic And Foreign Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Unpaid losses and loss adjustment expenses	$ 164,497	$ 144,761
Unearned premiums recognized for income tax purposes	85,952	74,282
Life and annuity benefits	78,370	77,945
Net operating loss carryforwards	46,662	29,252
Tax credit carryforwards	39,877	48,938
Accrued incentive compensation	30,308	23,167
Other differences between financial reporting and tax bases	39,763	60,995
Total gross deferred tax assets	485,429	459,340
Less valuation allowance	(36,286)	(25,225)
Total gross deferred tax assets, net of allowance	449,143	434,115
Investments	590,250	603,523
Goodwill and other intangible assets	124,953	171,681
Deferred policy acquisition costs	89,716	90,826
Other differences between financial reporting and tax bases	90,269	73,664
Total gross deferred tax liabilities	895,188	939,694
Net deferred tax liability	$ 446,045	$ 505,579