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Leases - Right of Use Assets and Lease Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Leases [Abstract]    
Operating lease right-of-use assets $ 29,697 $ 32,099
Property, plant and equipment, net 333 373
Total right-of use assets 30,030 32,472
Operating lease liabilities, current and long-term portions 32,560 34,097
Long-term debt, current and long-term portions 445 474
Total lease liabilities $ 33,005 $ 34,571