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Fair Value Measurement - Financial Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Level 1 to Level 2 Transfers, Amount | $ 0 |
Investments under executive deferred compensation plan | 25,878,000 | $ 25,494,000
Private equity securities | 37,000 | 38,000
Private equity securities measured at net asset value | 5,117,000 | 5,121,000
Obligations under executive deferred compensation plan | 25,878,000 | 25,494,000
Foreign currency forward contracts, liabilities | 241,000 | 4,954,000
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 | 25,878,000 | 25,494,000
Private equity securities | 37,000 | 38,000
Private equity securities measured at net asset value | 0 | 0
Obligations under executive deferred compensation plan | 25,878,000 | 25,494,000
Foreign currency forward contracts, liabilities | 0 | 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
Obligations under executive deferred compensation plan | 0 | 0
Foreign currency forward contracts, liabilities | 241,000 | 4,954,000
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
Obligations under executive deferred compensation plan | 0 | 0
Foreign currency forward contracts, liabilities | $ 0 | $ 0

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