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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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- Definition

Fair value, after the 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 not subject to a master netting arrangement and not elected to be offset.

+ References

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or 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 liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 55
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-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313

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The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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