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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Statutory U.S. federal income tax rate	21.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	0.10%	(0.80%)	1.90%
Tax credits	(7.90%)	(4.20%)	(0.80%)
Foreign rate differential	1.10%	(4.50%)	(4.70%)
Impact of change in enacted tax law	(1.30%)	(17.20%)
Change in valuation allowances	(3.00%)	4.20%	(121.60%)
U.S. tax on foreign earnings	1.00%
Compensation and benefits	1.30%	(1.10%)	0.30%
Other	4.90%	2.90%	(2.90%)
Effective Income Tax Rate Reconciliation, Percent, Total	17.20%	14.30%	(92.80%)

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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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