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Fair Value Measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation plan investments | $ 26,148 | $ 25,055
Total assets measured at fair value | 26,148 | 25,055
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation plan investments | 26,148 | 25,055
Total assets measured at fair value | $ 26,148 | $ 25,055

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