Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Finance leases:
Amortization expense	$ 367	$ 312	$ 738	$ 586
Interest on lease liabilities	44	37	96	41
Operating leases	8,904	3,435	13,188	7,127
Variable and short-term lease expense	10,485	4,818	17,596	9,609
Sublease Income	(48)	0	(98)	0
Total lease expense from continuing operations	$ 19,752	$ 8,602	$ 31,520	$ 17,363