Lessor Leases - Income Recognized from Sales-Type Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Sales-type lease revenues	$ 6,033	$ 9,017	$ 19,037	$ 33,833
Cost of sales-type lease revenues	(2,486)	(3,409)	(7,710)	(13,804)
Selling profit on sales-type lease revenues	3,547	5,608	11,327	20,029
Interest income on sales-type lease receivables	$ 450	$ 527	$ 1,437	$ 1,335