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Operating Leases (Operating Lease Cost) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Operating Leases [Abstract]        
Lease costs $ 3,260 $ 1,608 $ 10,148 $ 4,949
Variable lease costs 459 350 1,630 1,699
Short-term lease cost 358   386 104
Short-term lease benefit   81    
Lease income (125) (135) (374) (431)
Total lease cost $ 3,952 $ 1,904 $ 11,790 $ 6,321