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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 17, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Finite-Lived Intangible Assets |  |  |  |  |  |
Amortization expense |  | $ 1,428 | $ 1,622 | $ 4,271 | $ 4,947 |
Finite-lived intangible assets, net |  | 38,046 |  | 38,046 |  | $ 42,113
Accumulated Amortization |  | 41,523 |  | 41,523 |  | 38,656
LarKen Precast, LLC |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |
Business combination, consideration transferred | $ 1,406 |  |  |  |  |
Business combination, provisional information, initial accounting incomplete, adjustment, consideration transferred | 106 |  |  |  |  |
Business Combination, Contingent Consideration, Liability | $ 250 |  |  |  |  |
Non-compete agreements |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |
Fully amortized intangible assets |  | 1,186 |  | 1,186 |  |
Finite-lived intangible assets, net |  | 1 |  | 1 |  | 13
Accumulated Amortization |  | 45 |  | 45 |  | 1,259
Customer relationships |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |
Finite-lived intangible assets, net |  | 20,726 |  | 20,726 |  | 22,152
Accumulated Amortization |  | 14,999 |  | 14,999 |  | $ 13,453
Customer relationships | Test and Inspection Services |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |
Finite-lived intangible assets, net |  | 1,893 |  | 1,893 |  |
Accumulated Amortization |  | $ 587 |  | $ 587 |  |
Minimum |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |
Finite lived intangible asset, useful life |  |  |  | 5 years |  |
Maximum |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |
Finite lived intangible asset, useful life |  |  |  | 25 years |  |
Weighted Average |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |
Finite lived intangible asset, useful life |  |  |  | 16 years |  |
Weighted Average | Non-compete agreements |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |
Finite lived intangible asset, useful life |  |  |  | 5 years |  | 4 years
Weighted Average | Customer relationships |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |
Finite lived intangible asset, useful life |  |  |  | 18 years |  | 18 years

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + 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 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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