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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income before income taxes	$ 815,961	$ 315,565	$ 565,742
Income tax expense on income before income taxes	171,352	66,269	118,806
Tax effect of: State income taxes	5,749	5,111	5,777
Tax effect of: Tax exempt net investment income	(4,602)	(4,385)	(4,223)
Tax effect of: Tax rate differential on net operating loss carryback	(30,041)	0	0
Tax effect of: Worthless stock deduction	0	0	(7,448)
Tax effect of: Other	2,043	2,480	(5,186)
Total income tax expense included in consolidated statements of operations	$ 144,501	$ 69,475	$ 107,726
Effective tax rate	17.70%	22.00%	19.00%
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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