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Derivatives - Foreign Currency Derivative Contracts Outstanding (Details) - Not Designated as Hedging Instrument - Foreign currency contracts $ in Thousands | Jun. 30, 2018 USD ($) $ / $ $ / € $ / £ $ / kr | Dec. 31, 2017 USD ($) $ / $ $ / € $ / £ $ / kr
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Canadian dollar |  |
Derivative [Line Items] |  |
Notional Amount | $ 5,904 | $ 6,226
Contractual Exchange Rate | $ / $ | 1.3041 | 1.2850
Euro |  |
Derivative [Line Items] |  |
Notional Amount | $ 8,598 | $ 5,326
Contractual Exchange Rate | $ / € | 1.1777 | 1.1836
Norwegian krone |  |
Derivative [Line Items] |  |
Notional Amount | $ 5,233 | $ 6,212
Contractual Exchange Rate | $ / kr | 8.0266 | 8.3704
Pound sterling |  |
Derivative [Line Items] |  |
Notional Amount | $ 9,332 | $ 6,039
Contractual Exchange Rate | $ / £ | 1.3331 | 1.3419

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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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