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Business Combinations - Narratives (Details) - USD ($) $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 23, 2020 | Nov. 03, 2020 | Oct. 13, 2020 | Jul. 01, 2019 | Sep. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 01, 2020 | Sep. 30, 2020
Business Acquisition |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 865,900 | $ 811,400 | $ 487,200 | $ 817,600 | $ 817,600
Gain on bargain purchase |  |  |  |  |  |  | 5,000 | 0 | 0 |  |
Intangible assets amortization expense |  |  |  |  |  |  | $ 45,700 | 39,800 | $ 21,900 |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible asset useful life |  |  |  |  |  |  | 2 years |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible asset useful life |  |  |  |  |  |  | 15 years |  |  |  |
Sustainable Energy Solutions, Inc. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business | $ 20,000 |  |  |  |  |  |  |  |  |  |
Potential earn-out not to exceed amount | 25,000 |  |  |  |  |  |  |  |  |  |
Net assets acquired, excluding goodwill | 13,400 |  |  |  |  |  |  |  |  |  |
Goodwill | 24,000 |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets | $ 17,300 |  |  |  |  |  |  |  |  |  |
BIG |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business |  | $ 20,000 |  |  |  |  |  |  |  |  |
Potential earn-out not to exceed amount |  | 6,000 |  |  |  |  |  |  |  |  |
Net assets acquired, excluding goodwill |  | 8,800 |  |  |  |  |  |  |  |  |
Goodwill |  | 14,800 |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  | $ 6,800 |  |  |  |  |  |  |  |  |
Alabama Trailers |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business |  |  | $ 10,000 |  |  |  |  |  |  |  |
Gain on bargain purchase |  |  | $ 5,000 |  |  |  |  |  |  |  |
AXC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business |  |  |  | $ 599,700 | $ 592,000 |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 287,900 |  | 287,500 |  |  |
Identifiable intangible assets |  |  |  |  |  | 256,400 |  | 256,400 |  |  |
Payment for working capital adjustments |  |  |  |  | $ 7,700 |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  | 103,100 |  |  |
Operating income |  |  |  |  |  |  |  | 4,600 |  |  |
Intangible assets amortization expense |  |  |  |  |  |  |  | 16,800 |  |  |
Acquisition costs |  |  |  |  |  |  |  | $ 5,400 |  |  |
Property, plant and equipment |  |  |  |  |  | $ 400 |  |  |  |  |
AXC | Minimum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible asset useful life |  |  |  | 1 year |  |  |  |  |  |  |
AXC | Maximum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible asset useful life |  |  |  | 14 years |  |  |  |  |  |  |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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