Summary of Significant Accounting Policies Major Customers and Credit Risk (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Concentration percentage	100.00%	100.00%	100.00%
Concentration Risk, Customer	no	0	0
Accounts Receivable [Member] | Eastern Hemisphere [Member] | Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration percentage	55.00%
Accounts Receivable [Member] | Western Hemisphere [Member] | Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration percentage	45.00%
Accounts Receivable [Member] | UNITED STATES | Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration percentage	18.00%
Accounts Receivable [Member] | MEXICO | Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration percentage	10.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration percentage	10.00%	10.00%	10.00%