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Income Taxes (Reconciliation of Provision of Income Taxes) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal income tax provision at the statutory rate	21.00%	35.00%	35.00%
State income tax provision, net of federal effect	3.70%	2.60%	(6.70%)
Change in deferred taxes due to change in law	27.00%	(9.90%)	(1.20%)
Excess tax benefits related to employee share-based compensation	(0.70%)	(4.00%)	0.00%
Non-U.S. subsidiary earnings	0.10%	(6.00%)	(7.30%)
Tax credits and deductions	(0.20%)	(1.00%)	(5.10%)
Change in unrecognized tax benefits	4.70%	(0.80%)	4.20%
Other, net	1.40%	0.50%	1.40%
Actual income tax provision	57.00%	16.40%	20.30%

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Effective Income Tax Rate Reconciliation Change In Unrecognized Tax Benefits, Percent

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