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v3.19.1

Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Deferred compensation plan assets |  |  | $ 286 | $ 260
Derivatives Designated as Hedging Instruments | Commodity contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives | $ (914) | $ (1,571) |  |
Derivatives Designated as Hedging Instruments | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  |  | 155 | (1,712)
Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  |  | (164) | 166
Assets measured at NAV |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Deferred compensation plan assets |  |  | 0 | 0
Assets measured at NAV | Derivatives Designated as Hedging Instruments | Commodity contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  |  | 0 | 0
Assets measured at NAV | Derivatives Designated as Hedging Instruments | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  |  | 0 | 0
Assets measured at NAV | Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  |  | 0 | 0
Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Deferred compensation plan assets |  |  | 286 | 260
Level 1 | Derivatives Designated as Hedging Instruments | Commodity contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  |  | 0 | 0
Level 1 | Derivatives Designated as Hedging Instruments | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  |  | 0 | 0
Level 1 | Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  |  | 0 | 0
Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Deferred compensation plan assets |  |  | 0 | 0
Level 2 | Derivatives Designated as Hedging Instruments | Commodity contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  |  | (914) | (1,571)
Level 2 | Derivatives Designated as Hedging Instruments | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  |  | 155 | (1,712)
Level 2 | Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  |  | (164) | 166
Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Deferred compensation plan assets |  |  | 0 | 0
Level 3 | Derivatives Designated as Hedging Instruments | Commodity contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  |  | 0 | 0
Level 3 | Derivatives Designated as Hedging Instruments | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  |  | 0 | 0
Level 3 | Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  |  | $ 0 | $ 0

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