Route and Customer Acquisition Costs - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Gross payments due	$ 6,200		$ 6,200		$ 6,400
Net present value of payments due	5,500		5,500		5,700
Current portion of payments due	2,018		2,018		1,608
Customer acquisition cost asset	18,300		18,300		17,700
Capitalized contract cost, subject to claw back	1,500		1,500		$ 1,700
Amortization expense (decrease in expense) on route and customer acquisition costs	$ 500	$ 500	$ 1,400	$ 1,400