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Operating Segments, Geographic Analysis and Major Customers (Concentration) (Details) - Total operating revenues - Operating revenues	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shell
Concentration Risk
Percentage of concentration	26.00%	26.00%	17.00%
Equinor
Concentration Risk
Percentage of concentration	21.00%	18.00%
Chevron
Concentration Risk
Percentage of concentration	17.00%	21.00%	29.00%
Petrobras
Concentration Risk
Percentage of concentration			14.00%

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