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Revenue from Contracts with Customers (ASC 606) Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]        
Revenue recognized $ 610 $ 434 $ 1,216 $ 907