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Derivatives - Foreign Currency Derivative Contracts (Details) - Not Designated as Hedging Instrument $ in Thousands | Dec. 31, 2017 USD ($) $ / € $ / CAD $ / £ $ / NOK | Dec. 31, 2016 USD ($) $ / € $ / CAD $ / £ $ / NOK
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Canadian dollar | Foreign currency contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 6,226 | $ 4,553
Contractual exchange rate (percent) | $ / CAD | 1.2850 | 1.3179
Euro | Foreign currency contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 5,326 | $ 4,753
Contractual exchange rate (percent) | $ / € | 1.1836 | 1.0563
Euro | Foreign currency contracts, settlement date January 13, 2017 |  |
Derivative [Line Items] |  |
Notional amount |  | $ 2,558
Contractual exchange rate (percent) | $ / € |  | 1.0659
Norwegian krone | Foreign currency contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 6,212 | $ 3,643
Contractual exchange rate (percent) | $ / NOK | 8.3704 | 8.5101
Pound sterling | Foreign currency contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 6,039 | $ 3,908
Contractual exchange rate (percent) | $ / £ | 1.3419 | 1.2607

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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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