Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases
Amortization of ROU Assets	$ 248
Interest on Lease Liabilities	31
Operating lease cost	24,166	$ 24,890
Short-term lease cost	5,804	6,925
Variable lease cost	4,816	5,979
Total lease cost	35,065	37,794
Operating cash flows from operating leases	18,870	24,140
Financing cash flows from finance leases	490
Operating cash flows from finance leases	31
ROU assets obtained in exchange for lease liabilities	7,774	$ 4,808
ROU assets obtained in exchange for finance lease liabilities	$ 2,428
Weighted-average remaining lease term (in years)	18 years 9 months 29 days
Weighted-average discount rate	6.95%
Weighted-average remaining finance lease term (in years)	3 years 7 months 2 days
Weighted-average discount rate	3.81%