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Derivatives - Foreign Currency Derivative Contracts Outstanding (Details) - Not Designated as Hedging Instrument - Foreign currency contracts $ in Thousands | Mar. 31, 2019 USD ($) $ / £ $ / € $ / kr $ / $ | Dec. 31, 2018 USD ($) $ / £ $ / € $ / kr $ / $
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Canadian dollar |  |
Derivative [Line Items] |  |
Notional Amount | $ 1,349 | $ 2,248
Contractual Exchange Rate | $ / $ | 1.3342 | 1.3343
Euro |  |
Derivative [Line Items] |  |
Notional Amount | $ 7,959 | $ 6,967
Contractual Exchange Rate | $ / € | 1.1370 | 1.1421
Norwegian krone |  |
Derivative [Line Items] |  |
Notional Amount | $ 9,333 | $ 7,713
Contractual Exchange Rate | $ / kr | 8.5721 | 8.5566
Pound sterling |  |
Derivative [Line Items] |  |
Notional Amount | $ 19,300 | $ 16,452
Contractual Exchange Rate | $ / £ | 1.3310 | 1.2655

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- 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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- Definition Contractual rate at which a foreign currency can be purchased or sold. + References No definition available. + Details
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- 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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