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Significant Accounting Policies - Impairment of Long-Lived Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Impairment of definite-lived assets |  | $ 7,100 |  |  |  |  |  |
Asset impairments |  |  |  |  |  | $ 3,087 | $ 10,155 | $ 0
Property, plant and equipment |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  | $ 2,900 |  |
FMT |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Asset impairments | $ 2,500 |  |  |  |  |  |  |
Operating lease, impairment | 900 |  |  |  |  |  |  |
FMT | Corporate Office |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Asset impairments | 600 |  |  |  |  |  |  |
FMT | Property, plant and equipment |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Asset impairments | 1,600 |  |  |  |  |  |  |
FMT | Property, plant and equipment | Corporate Office |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Asset impairments | 200 |  |  |  |  |  |  |
Operating lease, impairment | $ 400 |  |  |  |  |  |  |
HST |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  | $ 9,700 |  |  |
Operating lease, impairment |  |  | $ 400 | $ 600 |  |  |  |
HST | Customer relationships |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Impairment of definite-lived assets |  |  |  |  | 6,100 |  |  |
HST | Unpatented technology |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Impairment of definite-lived assets |  |  |  |  | 1,000 |  |  |
HST | Property, plant and equipment |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |  |
Asset impairments |  |  |  |  | $ 2,000 |  |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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