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Derivatives - Effect of Derivative Instruments on Balance Sheet (Details) - Derivatives designated as hedging instruments - Interest rate swaps - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value Asset (Liability) |  |
Total derivatives | $ 13,079 | $ 4,542
Other current assets |  |
Fair Value Asset (Liability) |  |
Derivative assets | 3,592 | 186
Other long-term assets |  |
Fair Value Asset (Liability) |  |
Derivative assets | 9,487 | 4,490
Accrued liabilities |  |
Fair Value Asset (Liability) |  |
Derivative liabilities | $ 0 | $ (134)

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