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Commitments And Contingencies (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Feb. 21, 2020
Dec. 31, 2018
Other Commitments [Line Items]      
Purchase obligations $ 53,922,000   $ 114,396,000
Management      
Other Commitments [Line Items]      
Duration of employment agreement 3 years    
Subsequent Event      
Other Commitments [Line Items]      
Estimated litigation liability   $ 0