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Derivatives - Foreign Currency Derivative Contracts Outstanding (Details) - Not Designated as Hedging Instrument - Foreign currency contracts $ in Thousands | Sep. 30, 2019 USD ($) $ / £ $ / € $ / kr $ / $ | Dec. 31, 2018 USD ($) $ / £ $ / € $ / kr $ / $
--- | --- | ---
Canadian dollar |  |
Derivative [Line Items] |  |
Notional Amount | $ 1,362 | $ 2,248
Contractual Exchange Rate | $ / $ | 1.3220 | 1.3343
Euro |  |
Derivative [Line Items] |  |
Notional Amount | $ 7,457 | $ 6,967
Contractual Exchange Rate | $ / € | 1.1130 | 1.1421
Norwegian krone |  |
Derivative [Line Items] |  |
Notional Amount | $ 10,254 | $ 7,713
Contractual Exchange Rate | $ / kr | 8.9717 | 8.5566
Pound sterling |  |
Derivative [Line Items] |  |
Notional Amount | $ 16,089 | $ 16,452
Contractual Exchange Rate | $ / £ | 1.2377 | 1.2655

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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