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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income before income taxes	$ 602,747	$ 815,961	$ 315,565
Income tax expense on income before income taxes	126,577	171,352	66,269
Tax effect of: State income taxes	5,239	5,749	5,111
Tax effect of: Tax exempt net investment income	(4,715)	(4,602)	(4,385)
Tax effect of: Tax rate differential on net operating loss carryback	0	(30,041)	0
Tax effect of: Other	1,654	2,043	2,480
Total income tax expense included in consolidated statements of operations	$ 128,755	$ 144,501	$ 69,475
Effective tax rate	21.40%	17.70%	22.00%
Statutory federal income tax rate	21.00%	21.00%	21.00%
Effective statutory tax rate used for net operating loss carryback		35.00%

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