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Commitments and Contingencies Lease Liabilities Cash Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Financing Lease Liability Activity        
Finance Lease, Principal Payments $ 33 $ 281 $ 33 $ 478
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 0 0 0 2,136
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability $ 33 $ 291 $ 33 $ 494