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.

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The net gain (loss) during the reporting period due to ineffectiveness in foreign currency cash flow hedges. Recognized in earnings.

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The net gain (loss) during the reporting period due to ineffectiveness in interest rate cash flow hedges. Recognized in earnings.

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Fair Value Measurements - Summary of Financial Liability Measured at Fair Value on a Recurring Basis (Details 2) - Designated as Hedging Instrument - Cash Flow Hedge - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest Rate Swap
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge		$ (753)	$ 768
Interest rate swap - cash flow hedge, loss	$ 37	(928)
Foreign currency hedges
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge	742	601	$ 0
Interest rate swap - cash flow hedge, loss		18
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness	(38)
Fair Value, Measurements, Recurring \| Interest Rate Swap
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge	971	753
Fair Value, Measurements, Recurring \| Foreign currency hedges
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge	(742)	(601)
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Interest Rate Swap
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge	971
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Foreign currency hedges
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge	$ (742)
Fair Value, Measurements, Recurring \| Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2) \| Interest Rate Swap
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge		753
Fair Value, Measurements, Recurring \| Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2) \| Foreign currency hedges
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge		$ (601)