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Condensed consolidating financial statements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Statements of Income and Comprehensive Income [Line Items]
Change in foreign currency translation, tax	$ 0	$ 0	$ 0
Eliminations
Condensed Statements of Income and Comprehensive Income [Line Items]
Change in foreign currency translation, tax	0	0	0
FET (Parent) | Reportable Legal Entities
Condensed Statements of Income and Comprehensive Income [Line Items]
Change in foreign currency translation, tax	0	0	0
Guarantor Subsidiaries | Reportable Legal Entities
Condensed Statements of Income and Comprehensive Income [Line Items]
Change in foreign currency translation, tax	0	0	0
Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed Statements of Income and Comprehensive Income [Line Items]
Change in foreign currency translation, tax	$ 0	$ 0	$ 0

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[Line Items] for Condensed Statements of Income and Comprehensive Income [Table]

+ References

No definition available.

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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580

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