Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Finance leases:
Amortization expense	$ 475	$ 371
Interest on lease liabilities	102	52
Operating leases	8,372	4,284
Variable and short-term lease expense	12,679	7,111
Sublease Income	(49)	(50)
Total lease expense from continuing operations	$ 21,579	$ 11,768