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Headquarter Relocation and Consolidation (Narrative) (Details) - Headquarter Relocation [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring expense $ 0 $ 0 $ 269
Grant Agreement, Maximum Value 1,400    
Grant income $ 0 $ 429 $ 312