Segment Information (Geographic Information) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 37,354	$ 32,370	$ 17,458	$ 69,724	$ 22,655
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	37,354		17,458	69,724	22,655
Long-Lived Assets	57,688			57,688		$ 69,110
Operating Segments [Member] | United States [Member]
Segment Reporting Information [Line Items]
Revenues	37,354		17,458	69,724	22,655
Long-Lived Assets	26,255			26,255		48,126
Operating Segments [Member] | Mexico [Member]
Segment Reporting Information [Line Items]
Revenues	0		$ 0	0	$ 0
Long-Lived Assets	$ 31,433			$ 31,433		$ 20,984