Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands			12 Months Ended
Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income before income taxes			$ 565,742	$ 316,271	$ 130,247
Income tax expense on income before income taxes			118,806	110,695	45,586
Tax effect of: State income taxes			5,777	1,961	2,559
Tax effect of: Tax exempt net investment income			(4,223)	(4,288)	(2,167)
Tax effect of: Impact of Tax Reform			0	35,932	0
Tax effect of: Worthless stock deduction			(7,448)	0	0
Tax effect of: Other			(5,186)	(2,674)	1,026
Total income tax expense included in consolidated statements of operations			$ 107,726	$ 141,626	$ 47,004
Effective tax rate			19.00%	44.80%	36.10%
Statutory federal income tax rate	21.00%		21.00%	35.00%	35.00%
Enacted tax rate applied to deferred tax balances, percent		21.00%

Enactment date effective tax rate applied to deferred tax balances.

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