Segments - Revenue and Assets by Country (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Rental revenue	$ 69,260	$ 62,442	$ 219,484	$ 186,789
Loss before income taxes	10,335	17,516	39,787	28,827
Assets	769,456		769,456		$ 815,284
United States
Segment Reporting Information [Line Items]
Rental revenue	67,506	60,115	213,576	181,248
Assets	763,013		763,013		802,516
Canada
Segment Reporting Information [Line Items]
Rental revenue	1,754	1,918	4,121	4,599
Assets	5,983		5,983		8,152
Mexico
Segment Reporting Information [Line Items]
Rental revenue	0	409	1,787	942
Loss before income taxes	800	$ 2,000	1,900	$ 3,800
Assets	$ 460		$ 460		$ 4,616