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Leases (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Commitments [Line Items]      
Rent expense $ 8,800    
Rent expense   $ 6,175 $ 8,095
Operating lease payments $ 6,802    
Minimum      
Other Commitments [Line Items]      
Remaining lease term 1 year    
Maximum      
Other Commitments [Line Items]      
Remaining lease term 46 years