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Derivatives - Effect of Derivative Instruments on Balance Sheet (Details) - Derivatives designated as hedging instruments - Interest rate swaps - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value Asset (Liability)
Total derivatives	$ 11,866	$ 4,542
Other current assets
Fair Value Asset (Liability)
Derivative assets	2,816	186
Other long-term assets
Fair Value Asset (Liability)
Derivative assets	9,050	4,490
Accrued liabilities
Fair Value Asset (Liability)
Derivative liabilities	$ 0	$ (134)

X

- Definition

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

+ References

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- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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