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Derivative Financial Instruments - Narratives (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($) instrument	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2012 USD ($) instrument	Jun. 24, 2012 USD ($) instrument
Derivative
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax	$ 59	$ 0
Foreign exchange derivative
Derivative
Derivative Asset	301
Derivative Liability	225
Cash Flow Hedge | Designated As Hedging | Foreign currency forward contracts
Derivative
Foreign currency cash flow hedge gain to be reclassified during next 12 months	5
Derivative, notional amount	21,100
Derivative Asset	76
Derivative Liability			$ (742)	$ (601)
Cash Flow Hedge | Designated As Hedging | Interest rate swap
Derivative
Derivative, notional amount					$ 25,000	$ 50,000
Number of derivative instruments held | instrument		3			4	4
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months	524
Derivative Asset	$ 1,359		$ 971	$ 753

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- Definition

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

+ References

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-Publisher SEC
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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.

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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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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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Amount of net unrealized gain (loss) related to the change in fair value of foreign currency exchange rate derivatives designated as cash flow hedging instruments. Recorded in accumulated other comprehensive income to the extent that the cash flow hedge is determined to be effective.

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