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Fair Value Measurement - Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details) - Recurring - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Liabilities: |  |
Total liabilities | $ 6,027 | $ 3,529
Fair Value, Inputs, Level 2 |  |
Assets: |  |
Asset derivatives | 766 | 233
Fair Value, Inputs, Level 2 | Interest Rate Swap |  |
Assets: |  |
Asset derivatives | 733 | 233
Liabilities: |  |
Liability derivatives | 3,187 | 3,529
Fair Value, Inputs, Level 2 | Commodity swap |  |
Assets: |  |
Asset derivatives | 33 | 0
Liabilities: |  |
Liability derivatives | 70 | 0
Fair Value, Inputs, Level 2 | Hybrid Instrument |  |
Liabilities: |  |
Liability derivatives | 1,808 | 0
Fair Value, Inputs, Level 3 |  |
Liabilities: |  |
Contingent consideration liabilities | $ 962 | $ 0

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