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Income Taxes - Differences between Statutory Federal Income Tax Rate and Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	4.30%	3.60%	3.30%
Remeasurement of deferred taxes, associated with 2017 Tax Act	(37.60%)	0.00%	0.00%
Valuation allowance	3.60%	(3.70%)	1.70%
Domestic production deduction	(2.30%)	(2.40%)	(2.20%)
Tax planning benefits, excluding valuation allowance effects	0.00%	0.00%	(6.00%)
Tax reserves	0.10%	(1.00%)	0.20%
Tax credits	(0.90%)	(0.80%)	1.90%
Foreign tax rate effects	(0.50%)	0.80%	0.50%
Other, net	(0.90%)	(0.90%)	(0.30%)
Effective income tax rate	0.80%	30.60%	34.10%

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

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