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Income Taxes - Reconciliation of Federal Statutory Rate and Effective Rate (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
Rate of state income taxes, net of federal tax benefit	4.50%	2.80%	2.00%
Statutory rate other than U.S. statutory rate	0.10%	0.40%	0.00%
Sec. 987 regulation change, federal and state impact	(0.00%)	1.20%	(0.00%)
U.S. federal research and development credit	3.00%	1.50%	1.00%
Impacts of U.S. federal tax reform	14.20%	0.00%	0.00%
Other, net	(1.20%)	(0.70%)	1.90%
Effective tax rate	55.60%	40.20%	39.90%

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Effective Income Tax Rate Reconciliation, Change In Regulation, Domestic, State And Local, Percent

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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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