Summary of Significant Accounting Policies, Concentrations of Credit Risk (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) Customer	Dec. 31, 2018 USD ($)	Dec. 31, 2017
Concentration Risk [Abstract]
Foreign cash balance | $	$ 8.5	$ 11.1
Customer Concentration Risk [Member]
Concentration Risk [Abstract]
Number of largest individual customers | Customer	5
Net Sales [Member] | Customer Concentration Risk [Member]
Concentration Risk [Abstract]
Concentration risk, percentage	69.00%	70.00%	70.00%
Net Sales [Member] | Customer Concentration Risk [Member] | O' Reilly [Member]
Concentration Risk [Abstract]
Concentration risk, percentage	22.00%
Net Sales [Member] | Customer Concentration Risk [Member] | Advance [Member]
Concentration Risk [Abstract]
Concentration risk, percentage	16.00%
Net Sales [Member] | Customer Concentration Risk [Member] | NAPA [Member]
Concentration Risk [Abstract]
Concentration risk, percentage	15.00%
Net Sales [Member] | Customer Concentration Risk [Member] | AutoZone [Member]
Concentration Risk [Abstract]
Concentration risk, percentage	11.00%