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Segment Information (Geographic Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]          
Revenues $ 25,202 $ 40,651 $ 47,857 $ 185,020  
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenues 25,202 40,651 47,857 185,020  
Long-Lived Assets 91,641   91,641   $ 133,971
Operating Segments [Member] | United States [Member]          
Segment Reporting Information [Line Items]          
Revenues 25,202 $ 40,651 47,857 $ 185,020  
Long-Lived Assets 85,720   85,720   132,825
Operating Segments [Member] | Mexico [Member]          
Segment Reporting Information [Line Items]          
Long-Lived Assets $ 5,921   $ 5,921   $ 1,146