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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 13, 2015
Goodwill impairment | $ 128,938,000 | $ 0 | $ 61,142,000 | $ 80,337,000 |
Goodwill |  | 19,785,000 | 18,932,000 | 81,752,000 |
Aggregate goodwill impairment |  | 141,479 |  |  |
Impairment of finite lived intangible assets |  | 0 | 59,786,000 | 0 |
Amortization expense |  | $ 6,992,000 | 9,575,000 | 12,245,000 |
Minimum |  |  |  |  |
Finite lived intangible assets useful life |  | 4 years |  |  |
Maximum |  |  |  |  |
Finite lived intangible assets useful life |  | 25 years |  |  |
Weighted Average |  |  |  |  |
Finite lived intangible assets useful life |  | 15 years |  |  |
Rail Products and Services |  |  |  |  |
Goodwill impairment |  |  | 32,725,000 |  |
Goodwill |  | $ 14,638,000 | 13,785,000 | 48,188,000 |
Inspection Oilfield Services (IOS) |  |  |  |  |
Goodwill impairment |  |  |  | 69,908,000 |
Goodwill |  |  |  |  | $ 69,908,000
Impairment of finite lived intangible assets |  |  | 42,982,000 |  |
Chemtec Energy Services, LLC |  |  |  |  |
Goodwill impairment |  |  |  | $ 10,429,000 |
Impairment of finite lived intangible assets |  |  | $ 16,804,000 |  |

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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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