Reporting Segments (Percentage of Revenue) (Details) - Revenue [Member] - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Upstream [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue	100.00%	100.00%
Upstream [Member] | Customer A [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue	33.00%	33.00%
Upstream [Member] | Customer B [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue	41.00%	30.00%
Upstream [Member] | Customer C [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue	1.00%	16.00%
Upstream [Member] | Customer D [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue	18.00%	14.00%
Upstream [Member] | All Others [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue	7.00%	7.00%
Midstream [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue	100.00%
Midstream [Member] | Customer E [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue	100.00%