Leases - Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Lease, Cost [Abstract]
Operating cash flows for operating leases	$ 2,324	$ 6,604
Finance cash flows for finance leases	290	870
Operating right-of-use assets obtained in exchange for lease obligations during the current period	$ 1,616	$ 3,704