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Fair Value Measurement Fair Value Liabilities Measured on Recurring Basis, Unobservable Inputs (Details) - USD ($) $ in Thousands | 9 Months Ended |
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Sep. 30, 2018 | Dec. 31, 2017 | [1]
Fair Value Disclosures [Abstract] |  |
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) | $ 20,500 |
CONTINGENT EARN-OUT LIABILITY | $ 47,500 | $ 27,000
[1] | December 31, 2017 balances were derived from audited consolidated financial statements.

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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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