Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Leases [Abstract]
Expense associated with leases	$ 3,500		$ 10,300
Operating lease expense	2,900		8,400
Short-term lease expense	575		1,900
Rental income	$ 25	$ 140	$ 116	$ 389