Income Taxes (Net Deferred Income Tax Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Abstract]
Loss reserve	$ 129,861	$ 96,840
Unearned premium reserve	107,724	85,028
Foreign tax credits	30,885	31,989
Net operating loss carryforward	21,787	46,109
Lease liability	20,228	33,504
Net unrealized losses on benefit plans	13,395	19,636
Equity compensation	7,558	7,367
Other tax credits	6,160	1,121
Uncollectible reinsurance reserves	4,486	603
Investment impairments	3,142	3,142
Unrealized foreign currency losses	213	4,591
Other assets	8,973	7,285
Total deferred tax assets	354,412	337,215
Net unrealized investment gains	99,395	79,994
Deferred acquisition costs	97,974	75,692
Net fair value income	56,699	26,119
Right of use asset	36,615	90,268
Partnership investments	27,111	28,822
Benefit plan asset	1,667	1,765
Other liabilities	9,963	6,710
Total deferred tax liabilities	329,424	309,370
Net deferred tax assets	24,988	27,845
Less: Valuation allowance	(17,765)	(28,805)
Total net deferred tax assets	$ 7,223
Total net deferred tax (liabilities)		$ (960)