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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands			12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income before income taxes			$ 315,565	$ 565,742	$ 316,271
Income tax expense on income before income taxes			66,269	118,806	110,695
Tax effect of: State income taxes			5,111	5,777	1,961
Tax effect of: Tax exempt net investment income			(4,385)	(4,223)	(4,288)
Tax effect of: Impact of Tax Reform			0	0	35,932
Tax effect of: Worthless stock deduction			0	(7,448)	0
Tax effect of: Other			2,480	(5,186)	(2,674)
Total income tax expense included in consolidated statements of operations			$ 69,475	$ 107,726	$ 141,626
Effective tax rate			22.00%	19.00%	44.80%
Statutory federal income tax rate	21.00%		21.00%	21.00%	35.00%
Enacted tax rate applied to deferred tax balances, percent		21.00%

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