Fair Value Measurements - Reconciliation of Recurring Financial Liability Related to Interest Rate Swaps (Details) - Designated As Hedging - Cash Flow Hedge - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Interest rate swap
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Cost of Hedge Net of Cash Received	$ (156)	$ 421
Reconciliation of the recurring financial derivatives
Beginning balance, derivative asset	945	971
Total gains/(losses) for the period:
Included in earnings	156	(421)
Included in other comprehensive income	(275)	(26)
Ending balance, derivative asset	670	945
Foreign currency hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Cost of Hedge Net of Cash Received	(112)	(402)
Reconciliation of the recurring financial derivatives
Beginning balance, derivative liability	(393)	742
Total gains/(losses) for the period:
Included in earnings	59	484
Included in other comprehensive income	375	1,053
Ending balance, derivative liability		$ (393)
Ending balance, derivative asset	$ 715

Derivative, Net (Cost) Receipt of Cash

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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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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.

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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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