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Fair Value Measurement - Financial Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments under executive deferred compensation plan | $ 27,871 | $ 25,494
Private equity securities | 31 | 38
Private equity securities measured at net asset value | 7,194 | 5,121
Foreign currency forward contracts, assets | 142 |
Obligations under executive deferred compensation plan | 27,871 | 25,494
Foreign currency forward contracts, liabilities |  | 4,954
Quoted Prices in Active Markets for Identical Items (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments under executive deferred compensation plan | 27,871 | 25,494
Private equity securities | 31 | 38
Private equity securities measured at net asset value | 0 | 0
Foreign currency forward contracts, assets | 0 |
Obligations under executive deferred compensation plan | 27,871 | 25,494
Foreign currency forward contracts, liabilities |  | 0
Quoted Prices in Active Markets for Similar Items (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments under executive deferred compensation plan | 0 | 0
Private equity securities | 0 | 0
Private equity securities measured at net asset value | 0 | 0
Foreign currency forward contracts, assets | 142 |
Obligations under executive deferred compensation plan | 0 | 0
Foreign currency forward contracts, liabilities |  | 4,954
Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments under executive deferred compensation plan | 0 | 0
Private equity securities | 0 | 0
Private equity securities measured at net asset value | 0 | 0
Foreign currency forward contracts, assets | 0 |
Obligations under executive deferred compensation plan | $ 0 | 0
Foreign currency forward contracts, liabilities |  | $ 0

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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