Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Finance leases:
Amortization expense	$ 474	$ 367	$ 949	$ 738
Interest on lease liabilities	109	44	211	96
Operating leases	8,370	8,904	16,742	13,188
Variable and short-term lease expense	13,516	10,485	26,195	17,596
Sublease Income	(2)	(48)	(51)	(98)
Total lease expense from continuing operations	$ 22,467	$ 19,752	$ 44,046	$ 31,520