Leases - Leases Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 8,085	$ 7,939	$ 25,298	$ 25,741
Amortization of right of use assets	126	157	433	471
Interest on lease liabilities	697	31	1,977	96
Total finance lease cost	823	188	2,410	567
Short-term lease cost	3,427	2,587	9,824	6,422
Variable lease cost	2,312	1,541	6,344	4,059
Total lease cost	$ 14,647	$ 12,255	$ 43,876	$ 36,789