XML 44 R31.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Inventories (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Inventory Disclosure [Abstract] |
Schedule of Inventory | The Company’s significant components of inventory at December 31, 2021 and 2020 were as follows (in thousands):
| December 31, 2021 |  | December 31, 2020
Raw materials and parts | $ | 97,053 |  |  | $ | 151,531 |
Work in process | 24,618 |  |  | 15,946 |
Finished goods | 182,954 |  |  | 229,212 |
Gross inventories | 304,625 |  |  | 396,689 |
Inventory reserve | (62,885) |  |  | (144,942) |
Inventories | $ | 241,740 |  |  | $ | 251,747 |
Schedule of Inventory Reserve | The change in the amounts of the inventory reserve during the two year period ended December 31, 2021 is as follows (in thousands):
Period ended | Balance at beginning of period |  | Charged to expense |  | Deductions or other |  | Balance at end of period
December 31, 2020 | 66,075 |  |  | 100,794 |  |  | (21,927) |  |  | $ | 144,942 |
December 31, 2021 | 144,942 |  |  | 8,096 |  |  | (90,153) |  |  | $ | 62,885 |

X
- Definition Schedule of Inventory Reserve [Table Text Block] + References No definition available. + Details
Name: | fet_ScheduleOfInventoryReserveTableTextBlock
Namespace Prefix: | fet_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InventoryDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -URI http://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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
Name: | us-gaap_ScheduleOfInventoryCurrentTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration