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Derivative Financial Instruments - Fair Value of Derivative Instruments (Details) - Cash Flow Hedge - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Interest rate swap | Other Current Assets [Member] |  |  |
Derivative Liability |  |  |
Derivative Asset | $ 524 | $ 278 |
Interest rate swap | Other Noncurrent Assets [Member] |  |  |
Derivative Liability |  |  |
Derivative Asset | 835 | 693 |
Foreign currency hedges | Other Current Liabilities [Member] |  |  |
Derivative Liability |  |  |
Derivative Liability | 0 | (742) |
Foreign currency hedges | Other Current Assets [Member] |  |  |
Derivative Liability |  |  |
Derivative Asset | 76 | 0 |
Designated as Hedging Instrument [Member] | Interest rate swap |  |  |
Derivative Liability |  |  |
Derivative Asset | 1,359 | 971 | $ 753
Designated as Hedging Instrument [Member] | Foreign currency hedges |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | 5 |  |
Derivative Liability |  |  |
Derivative Liability |  | $ (742) | $ (601)
Derivative Asset | $ 76 |  |

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