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Inventories (Inventory reserve) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Inventory Valuation Reserves Increase (Decrease) [Roll Forward] |  |
Balance at beginning of period | $ 62,885 | $ 144,942
Charged to expense | 2,698 | 8,096
Deductions or other | (26,292) | (90,153)
Balance at end of period | $ 39,291 | $ 62,885

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- Definition Inventory Valuation Reserves, Deduction and Other Reserve Decrease + References No definition available. + Details
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Namespace Prefix: | fet_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Inventory Valuation Reserves Increase (Decrease) [Roll Forward] + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Amount of valuation reserve for inventory. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.BB) -URI https://asc.fasb.org/extlink&oid=27011343&loc=d3e100047-122729 + Details
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Period Type: | instant

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- Definition Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=116847112&loc=d3e4542-108314 + Details
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Balance Type: | debit
Period Type: | duration