XML 52 R34.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Goodwill and intangible assets (Finite-Lived and Indefinite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Accumulated amortization | $ (154,059) | $ (147,892)
Intangible Assets Total, Gross carrying amount | 395,026 | 394,542
Intangible Assets Total, Net amortizable intangibles | 240,967 | 246,650
Trademark |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets | 5,230 | 5,230
Customer relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 280,381 | 280,297
Accumulated amortization | (106,206) | (101,636)
Net amortizable intangibles | 174,175 | 178,661
Patents and technology |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 34,359 | 34,140
Accumulated amortization | (10,739) | (10,264)
Net amortizable intangibles | 23,620 | 23,876
Non-compete agreements |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 7,295 | 7,269
Accumulated amortization | (6,431) | (6,292)
Net amortizable intangibles | 864 | 977
Trade names |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 45,601 | 45,446
Accumulated amortization | (16,557) | (15,890)
Net amortizable intangibles | 29,044 | 29,556
Distributor relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 22,160 | 22,160
Accumulated amortization | (14,126) | (13,810)
Net amortizable intangibles | $ 8,034 | $ 8,350
Minimum | Customer relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 4 years | 4 years
Minimum | Patents and technology |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 5 years | 5 years
Minimum | Non-compete agreements |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 3 years | 3 years
Minimum | Trade names |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 10 years | 10 years
Minimum | Distributor relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 8 years | 8 years
Maximum | Customer relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 15 years | 15 years
Maximum | Patents and technology |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 17 years | 17 years
Maximum | Non-compete agreements |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 6 years | 6 years
Maximum | Trade names |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 15 years | 15 years
Maximum | Distributor relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Amortization period | 15 years | 15 years

X
- Definition Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] + References No definition available. + Details
Name: | fet_FiniteLivedAndIndefiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | fet_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before accumulated amortization of intangible assets, excluding goodwill. + References No definition available. + Details
Name: | us-gaap_IntangibleAssetsGrossExcludingGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
Name: | us-gaap_IntangibleAssetsNetExcludingGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TrademarksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=fet_PatentsAndTechnologyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_NoncompeteAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TradeNamesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_DistributionRightsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |