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Operating Leases (Operating Lease Cost) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating Leases [Abstract]    
Lease costs $ 3,373 $ 3,338
Variable lease costs 493 588
Short-term lease cost 20  
Short-term lease benefit   (157)
Lease income (120) (123)
Total lease cost $ 3,766 $ 3,646