Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Finance leases:
Amortization expense	$ 377	$ 325	$ 1,115	$ 911
Interest on lease liabilities	43	27	139	68
Operating leases	8,558	4,391	21,745	11,518
Variable and short-term lease expense	11,572	6,759	29,169	16,367
Sublease Income	(51)	0	(150)	0
Total lease expense from continuing operations	$ 20,499	$ 11,502	$ 52,018	$ 28,864