Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease expense	$ 15,111	$ 14,824
Finance lease expense:
Amortization of assets	836	978
Interest on lease liabilities	14	48
Short-term lease expense	525	336
Variable lease expense	2,940	2,663
Total lease expense	$ 19,426	$ 18,849