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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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- Definition 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 + Details
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