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Hedging Transaction and Derivative Instruments - Narrative (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Dec. 14, 2017	Nov. 12, 2014
Foreign Exchange Forward | Cash Flow Hedging | Designated as hedging instrument
Derivative
Derivative, notional amount	$ 46,300,000	$ 17,900,000
Interest Rate Swap | Cash Flow Hedging | Designated as hedging instrument
Derivative
Derivative, notional amount			$ 50,000,000.0	$ 100,000,000
Foreign Currency Gain (Loss) | Not Designated as Hedging Instrument, Economic Hedge | Not designated as hedging instrument
Derivative
Derivative, notional amount	$ 18,800,000	$ 6,400,000

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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X

- Definition

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.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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