Leases Leases Cost (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 7,939	$ 25,741
Amortization of right of use assets	157	471
Interest on lease liabilities	31	96
Total finance lease cost	188	567
Short-term lease cost	2,587	6,422
Variable lease cost	1,541	4,059
Total lease cost	$ 12,255	$ 36,789