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Sale of Business (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Sale of Security Services Business [Abstract] |  |  |
Proceeds from Divestiture of Businesses | $ 50,000 |  |
Estimated Contingent Consideration receivable | 14,721 | $ 0 |
Due to buyer | 9,875 | 0 |
Gain (Loss) on Disposition of Business | $ 54,840 | $ 10,421 | $ 0

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- Definition Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant. + 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 (b) -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 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 + Details
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- Definition Due to buyer + References No definition available. + Details
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- Definition Estimated contingent consideration receivable + References No definition available. + Details
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- Definition Proceeds from sale of security services business + References No definition available. + Details
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- Definition Sale of Security Services Business [Abstract] + References No definition available. + Details
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