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Significant Accounting Policies - Summary of carrying amount of goodwill by reportable segment (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Significant Accounting Policies [Line Items] |  |
Goodwill | $ 32,150 | $ 32,150
Operating Segments | Technical Services |  |
Significant Accounting Policies [Line Items] |  |
Goodwill | 30,992 | 30,992
Operating Segments | Support Services |  |
Significant Accounting Policies [Line Items] |  |
Goodwill | $ 1,158 | $ 1,158

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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://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=77989000&loc=SL49117168-202975 Reference 2: 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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