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Fair Value Measurements - Contingent Consideration Liability (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 26, 2017 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) | May 31, 2017 USD ($)
FGC |  |  |  |  |  |  |
Additional information |  |  |  |  |  |  |
Potential contingent consideration | $ 1,500 |  |  |  |  |  | $ 1,500
Fair value of the contingent consideration | 1,200 |  |  |  |  |  | $ 1,200
Contingent consideration credited to other operating income (expense) |  |  |  | $ 500 |  |  |
Contingent consideration debited to other operating income (expense) |  |  | $ 800 |  |  |  |
Cash payment made | $ 33,000 | $ 1,500 |  |  |  |  |
Significant Unobservable Inputs (Level 3) |  |  |  |  |  |  |
Rollforward of contingent consideration liability level three fair value measurements |  |  |  |  |  |  |
Payment of earn out liability to FGC sellers |  |  |  |  | $ (1,469) |  |
Contingent Consideration Liability | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |  |
Rollforward of contingent consideration liability level three fair value measurements |  |  |  |  |  |  |
Beginning balance |  |  |  |  | 716 |  |
FGC acquisition |  |  |  |  |  | $ 1,200 |
Change in fair value of contingent consideration liability during year |  |  |  |  | $ 753 | (484) |
Ending balance |  |  |  | $ 716 |  | $ 716 |
Additional information |  |  |  |  |  |  |
Number of unobservable inputs | item |  |  |  |  | 2 |  |
Minimum probability of acquired entity meeting contractual operating performance target (as a percent) |  |  |  |  | 33.00% |  |
Maximum probability of acquired entity meeting contractual operating performance target (as a percent) |  |  |  |  | 100.00% |  |

X
- Definition Represents the contingent consideration credited to other operating income (expense) upon not meeting earnout target in a business combination. + References No definition available. + Details
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- Definition Represents the contingent consideration debited to other income (expense) upon meeting earnout target in a business combination. + References No definition available. + Details
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- Definition Represents the maximum probability of the acquired entity meeting the contractual operating performance target expressed as a percentage. + References No definition available. + Details
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- Definition Represents the minimum probability of acquired entity meeting the contractual operating performance target expressed as a percentage. + References No definition available. + Details
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- Definition Represents the number of unobservable inputs. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + 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 (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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