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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, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income before income taxes			$ 316,271	$ 130,247	$ 337,314
Income tax expense on income before income taxes			110,695	45,586	118,060
Tax effect of: state income taxes			1,961	2,559	2,924
Tax effect of: tax exempt net investment income			(4,288)	(2,167)	(3,834)
Tax effect of: impact of Tax Reform			35,932	0	0
Tax effect of: other			(2,674)	1,026	334
Total income tax expense included in consolidated statements of operations			$ 141,626	$ 47,004	$ 117,484
Effective tax rate			44.80%	36.10%	34.80%
Statutory federal income tax rate			35.00%
Enacted tax rate applied to deferred tax balances, percent		21.00%
Forecast [Member]
Statutory federal income tax rate	21.00%

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Enactment date effective tax rate applied to deferred tax balances.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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