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Segment Information (Geographic Information) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]    
Revenues $ 108,447 $ 229,958
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Revenues 108,447 229,958
Long-Lived Assets 69,110 133,971
Operating Segments [Member] | United States [Member]    
Segment Reporting Information [Line Items]    
Revenues 108,447 229,958
Long-Lived Assets 48,126 132,825
Operating Segments [Member] | Mexico [Member]    
Segment Reporting Information [Line Items]    
Long-Lived Assets $ 20,984 $ 1,146