Leases - Supplemental cash flow and other information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Leases [Abstract]
Operating cash flows from operating leases	$ 7,446
Operating cash flows from finance leases	1,180
Financing cash flows from finance leases	$ 2,243	$ 6,142