Fair Value Measurements - Reconciliation of Recurring Financial Liability Related to Interest Rate Swaps (Details 3) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Total gains/(losses) for the period:
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	$ 82	$ (94)	$ 36
Foreign currency hedges \| Designated as Hedging Instrument \| Cash Flow Hedge
Reconciliation of the recurring financial liability related to interest rate swaps
Beginning balance	(742)	(601)
Derivative, Cash Received on Hedge	(402)	(132)
Total gains/(losses) for the period:
Included in earnings		38
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	484	38
Included in other comprehensive earnings	1,053	(47)
Ending balance	393	(742)	(601)
Interest Rate Swap \| Designated as Hedging Instrument \| Cash Flow Hedge
Reconciliation of the recurring financial liability related to interest rate swaps
Beginning balance	971	753
Derivative, Cash Received on Hedge	(421)	(37)
Total gains/(losses) for the period:
Included in earnings	(421)	(37)
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	(421)
Included in other comprehensive earnings	(26)	218
Ending balance		$ 971	$ 753
Derivative Asset	$ (945)

Fair Value, Liabilities Measured on Recurring Basis, Reconciliation, Calculation [Roll Forward]

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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 amount of cash received during the period on settlement of a hedge.

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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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Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated as hedging instruments.

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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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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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