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Income Taxes (Schedule Of Effective Tax Rate) (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Taxes [Abstract]
Statutory U.S. federal income tax rate	21.00%	35.00%	35.00%
State income tax, net of related federal income tax benefit	5.60%	4.00%
Foreign operations	0.60%	0.70%
Federal credits	(1.20%)	(1.00%)
Executive compensation disallowed	1.60%	0.00%
Meals and entertainment	1.30%	0.00%
Other	(0.10%)	0.30%
Return to provision and other discrete items	8.10%	(1.00%)
Effective income tax rate	36.90%	38.00%

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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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