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Income Taxes - Differences between Statutory Federal Income Tax Rate and Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	4.50%	4.30%	3.60%
Remeasurement of deferred taxes, associated with 2017 Tax Act	0.00%	(37.60%)	0.00%
Valuation allowance	0.00%	3.60%	(3.70%)
Domestic production deduction	(0.00%)	(2.30%)	(2.40%)
Tax planning benefits, excluding valuation allowance effects	(8.10%)	0.00%	0.00%
Tax reserves	(0.30%)	0.10%	(1.00%)
Tax credits	(0.30%)	(0.90%)	(0.80%)
Foreign tax rate effects	0.30%	(0.50%)	0.80%
Other, net	(1.10%)	(0.90%)	(0.90%)
Effective income tax rate	16.00%	0.80%	30.60%

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