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Commitments and Contingencies Lease Liabilities Cash Activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Financing Lease Liability Activity    
Finance Lease, Principal Payments $ 0 $ 197
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 0 2,136
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability $ 0 $ 203