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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

X

- Definition

Contractual rate at which a foreign currency can be purchased or sold.

+ References

No definition available.

+ Details

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X

- 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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X

- 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

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- Details

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- Details

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- Details

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