Revenue - Disaggregation of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 157,678	$ 144,684	$ 449,579	$ 420,368
United States
Disaggregation of Revenue [Line Items]
Revenues	154,078	141,849	440,140	410,813
Canada
Disaggregation of Revenue [Line Items]
Revenues	603	913	2,565	2,195
Other countries
Disaggregation of Revenue [Line Items]
Revenues	$ 2,997	$ 1,922	$ 6,874	$ 7,360