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Operating Leases (Operating Lease Cost) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Operating Leases [Abstract]        
Lease costs $ 3,550 $ 1,812 $ 6,888 $ 3,341
Variable lease costs 583 665 1,171 1,349
Short-term lease cost 185   28 23
Short-term lease benefit   (133)    
Lease income (125) (141) (248) (296)
Total lease cost $ 4,193 $ 2,203 $ 7,839 $ 4,417