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Accounting For Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal income taxes at statutory rates		$ 69,542	$ 75,391	$ 64,967
Federal income taxes at statutory rates	21.00%	35.00%	35.00%	35.00%
Tax effect of regulatory treatment of utility plant differences		$ 3,482	$ 3,297	$ 4,358
Tax effect of regulatory treatment of utility plant differences		1.70%	1.50%	2.30%
State income tax expense		$ 1,110	$ 1,316	$ 1,012
State income tax expense		0.60%	0.60%	0.50%
Settlement of prior year tax returns and adjustment of tax reserves		$ (384)	$ 13	$ (992)
Settlement of prior year tax returns and adjustment of tax reserves		(0.20%)	0.00%	(0.50%)
Manufacturing deduction		$ (1,119)	$ 0	$ (1,198)
Manufacturing deduction		(0.60%)	(0.00%)	(0.60%)
Settlement of equity awards		$ (1,439)	$ (1,597)	$ 0
Settlement of equity awards		(0.70%)	(0.70%)	(0.00%)
Acquisition costs		$ 2,491	$ 0	$ 0
Acquisition costs		1.30%	0.00%	0.00%
Federal income tax rate change		$ 10,169	$ 0
Federal income tax rate change		5.10%	0.00%
Other		$ (1,094)	$ (334)	$ (698)
Other		(0.50%)	(0.10%)	(0.40%)
Total income tax expense		$ 82,758	$ 78,086	$ 67,449
Effective Income Tax Rate Reconciliation, Percent		41.70%	36.30%	36.30%

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