Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases
Amortization of ROU Assets	$ 9		$ 9
Interest on Lease Liabilities	1		1
Operating lease cost	6,285	$ 6,270	12,548	$ 12,397
Short-term lease cost	1,021	2,298	2,623	3,535
Variable lease cost	1,115	1,452	2,581	3,077
Total lease cost	8,431	10,020	17,762	19,009
Operating cash flows from operating leases	5,895	6,892	7,482	8,452
Operating cash flows from finance leases	184		184
Financing cash flows from finance leases	1		1
ROU assets obtained in exchange for lease liabilities	7,143	$ 3,772	7,472	$ 4,357
ROU assets obtained in exchange for finance lease liabilities	$ 857		$ 857
Weighted-average remaining lease term (in years)	19 years 1 month 6 days		19 years 1 month 6 days
Weighted-average discount rate	6.89%		6.89%
Weighted-average remaining finance lease term (in years)	3 years 11 months 15 days		3 years 11 months 15 days
Weighted-average discount rate	4.21%		4.21%