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Segment Information (Geographic Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]          
Revenues $ 17,458 $ 73,661 $ 22,655 $ 144,369  
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenues 17,458 73,661 22,655 144,369  
Long-Lived Assets 131,303   131,303   $ 133,971
Operating Segments [Member] | United States [Member]          
Segment Reporting Information [Line Items]          
Revenues 17,458 $ 73,661 22,655 $ 144,369  
Long-Lived Assets 125,748   125,748   132,825
Operating Segments [Member] | Mexico [Member]          
Segment Reporting Information [Line Items]          
Long-Lived Assets $ 5,555   $ 5,555   $ 1,146