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Operating Leases (Operating Lease Cost) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Operating Leases [Abstract]    
Lease costs $ 3,338 $ 1,529
Variable lease costs 588 684
Short-term lease cost (benefit) (157) 156
Lease income (123) (155)
Total lease cost $ 3,646 $ 2,214