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Leases (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases    
Sublease income $ 4,790 $ 4,112
Weighted-average remaining lease term - operating leases 10 years  
Weighted-average discount rate - operating leases 4.00%  
Minimum [Member] | Sublease    
Leases    
Future minimum sublease income under non-cancelable subleases $ 17,200