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Income Taxes (Income Tax Rate Reconciliation Schedule) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory rate	21.00%	35.00%	35.00%
State income taxes, net of federal benefit	(7.20%)	31.70%	14.10%
Non-qualified stock option shortfalls (windfalls), net	(29.40%)	1.90%	23.00%
Stock-based compensation	21.60%	(9.70%)	18.30%
Lobbying	15.20%	(9.10%)	8.90%
Research and development credits	(17.10%)	(1.50%)	(20.40%)
Changes in valuation allowance	72.80%
Tax reform - tax rate change	0.00%	355.90%	0.00%
Foreign income tax and income inclusion	6.80%	2.70%	10.90%
Non-deductible parking expense	3.10%	0.00%	0.00%
Other permanent differences	5.90%	0.70%	2.40%
Effective tax rate	92.70%	407.60%	92.20%

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Effective Income Tax Rate Reconciliation, Non-Deductible Lobbying Expenses

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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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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