Route and Customer Acquisition Costs - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Capitalized Contract Cost [Line Items]
Gross payments due	$ 6,800		$ 6,800		$ 7,400
Net present value of payments due	6,400		6,400		6,500
Current portion of payments due	1,675		1,675		1,700
Customer acquisition cost asset	18,600		18,600		18,700
Capitalized contract cost, subject to claw back	2,100		2,100		$ 2,200
Amortization expense (decrease in expense) on route and customer acquisition costs	$ 500	$ 600	$ 900	$ 1,300