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Supplemental Financial Information Schedule of Revenues by Major Customer (Details) - Sales Revenue, Services, Net [Member] - Customer Concentration Risk [Member]	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	100.00%	100.00%
TOTAL [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	22.00%	15.00%
BP [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	14.00%	14.00%
BP [Member] | Floaters [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	79.00%	76.00%
Petrobras [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	10.00%	16.00%
Other Customers [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	54.00%	55.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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- Definition

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+ References

No definition available.

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