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Financial Instruments - Fair Value (Details) - Derivatives designated as hedging instrument - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative assets: |  |
Total derivative assets | $ 13,486 | $ 1,043
Derivative liabilities: |  |
Total derivative liabilities | 114 | 448
Cash Flow Hedging |  |
Derivative assets: |  |
Total derivative assets | 4,687 | 1,043
Cash Flow Hedging | Prepaid and other current assets | Natural gas swaps |  |
Derivative assets: |  |
Total derivative assets | 248 | 0
Cash Flow Hedging | Prepaid and other current assets | Interest rate caps |  |
Derivative assets: |  |
Total derivative assets | 1,825 | 44
Cash Flow Hedging | Other long-term assets | Interest rate caps |  |
Derivative assets: |  |
Total derivative assets | 2,614 | 999
Cash Flow Hedging | Accrued liabilities | Natural gas swaps |  |
Derivative liabilities: |  |
Total derivative liabilities | 0 | 318
Cash Flow Hedging | Other long-term liabilities | Natural gas swaps |  |
Derivative liabilities: |  |
Total derivative liabilities | 114 | 130
Net Investment Hedging |  |
Derivative assets: |  |
Total derivative assets | 8,799 | 0
Net Investment Hedging | Prepaid and other current assets | Cross currency swaps |  |
Derivative assets: |  |
Total derivative assets | 6,894 | 0
Net Investment Hedging | Other long-term assets | Cross currency swaps |  |
Derivative assets: |  |
Total derivative assets | $ 1,905 | $ 0

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