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Derivatives - Foreign Currency Derivative Contracts (Details) - Not Designated as Hedging Instrument $ in Thousands | Jun. 30, 2016 USD ($) $ / £ $ / € $ / NOK $ / CAD | Dec. 31, 2015 USD ($) $ / £ $ / € $ / NOK $ / CAD
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Foreign currency contracts | Canadian dollar |  |
Derivative [Line Items] |  |
Notional Amount | $ 3,765 | $ 5,091
Contractual Exchange Rate | $ / CAD | 1.2749 | 1.3751
Foreign currency contracts | Euro |  |
Derivative [Line Items] |  |
Notional Amount |  | $ 19,706
Contractual Exchange Rate | $ / € |  | 1.0948
Foreign currency contracts | Norwegian kroner |  |
Derivative [Line Items] |  |
Notional Amount | $ 5,891 | $ 11,498
Contractual Exchange Rate | $ / NOK | 8.1482 | 8.6973
Foreign currency contracts | Pound sterling |  |
Derivative [Line Items] |  |
Notional Amount | $ 3,620 | $ 7,516
Contractual Exchange Rate | $ / £ | 1.4480 | 1.5031
Foreign currency contracts, settlement date September 13, 2016 | Euro |  |
Derivative [Line Items] |  |
Notional Amount | $ 4,420 |
Contractual Exchange Rate | $ / € | 1.1334 |
Foreign currency contracts, settlement date July 14, 2016 | Euro |  |
Derivative [Line Items] |  |
Notional Amount | $ 3,470 |
Contractual Exchange Rate | $ / € | 1.1192 |

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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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