Leases - Right of Use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease right-of-use assets	$ 29,478	$ 32,099
Property, plant and equipment, net	262	373
Total right-of use assets	29,740	32,472
Operating lease liabilities, current and long-term portions	32,138	34,097
Long-term debt, current and long-term portions	383	474
Total lease liabilities	$ 32,521	$ 34,571