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Derivatives - Foreign Currency Derivative Contracts (Details) - Not Designated as Hedging Instrument $ in Thousands	Sep. 30, 2017 USD ($) $ / € $ / £ $ / NOK $ / CAD	Dec. 31, 2016 USD ($) $ / € $ / £ $ / NOK $ / CAD
Foreign currency contracts | Canadian dollar
Derivative [Line Items]
Notional Amount	$ 5,740	$ 4,553
Contractual Exchange Rate | $ / CAD	1.2194	1.3179
Foreign currency contracts | Euro
Derivative [Line Items]
Notional Amount	$ 5,982	$ 4,753
Contractual Exchange Rate | $ / €	1.1963	1.0563
Foreign currency contracts | Norwegian krone
Derivative [Line Items]
Notional Amount	$ 5,338	$ 3,643
Contractual Exchange Rate | $ / NOK	7.8675	8.5101
Foreign currency contracts | Pound sterling
Derivative [Line Items]
Notional Amount	$ 7,961	$ 3,908
Contractual Exchange Rate | $ / £	1.3268	1.2607
Foreign currency contracts, settled October 13, 2017 | Euro
Derivative [Line Items]
Notional Amount	$ 2,399
Contractual Exchange Rate | $ / €	1.1993
Foreign currency contracts, settled January 13, 2017 | Euro
Derivative [Line Items]
Notional Amount		$ 2,558
Contractual Exchange Rate | $ / €		1.0659

X

- 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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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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