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Income Taxes - Differences between Statutory Federal Income Tax Rate and Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	21.00%	35.00%
State income taxes, net of federal tax benefit	3.20%	4.50%	4.30%
Remeasurement of deferred taxes, associated with 2017 Tax Act	0.00%	0.00%	(37.60%)
Valuation allowance	(0.60%)	0.00%	3.60%
Domestic production deduction	0.00%	0.00%	(2.30%)
Tax planning benefits, excluding valuation allowance effects	0.00%	(8.10%)	0.00%
Tax reserves	(0.40%)	(0.30%)	0.10%
Tax credits	(0.40%)	(0.30%)	(0.90%)
Foreign tax rate effects	0.40%	0.30%	(0.50%)
Excess tax benefits from stock compensation activity	(1.20%)	(0.80%)	(0.40%)
Other, net	(0.20%)	(0.30%)	(0.50%)
Effective income tax rate	21.80%	16.00%	0.80%

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