Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Finance leases:
Amortization expense	$ 743	$ 377	$ 1,692	$ 1,115
Interest on lease liabilities	129	43	340	139
Operating leases	8,554	8,558	25,296	21,745
Variable and short-term lease expense	12,756	11,572	38,952	29,169
Sublease Income	(1)	(51)	(52)	(150)
Total lease expense from continuing operations	$ 22,181	$ 20,499	$ 66,228	$ 52,018