Route and Customer Acquisition Costs - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Gross payments due	$ 6,500		$ 6,400
Net present value of payments due	5,800		5,700
Current portion of payments due	1,639		1,608
Customer acquisition cost asset	17,800		17,700
Capitalized contract cost, subject to claw back	1,600		$ 1,700
Amortization expense (decrease in expense) on route and customer acquisition costs	$ 500	$ 400