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Derivatives - Foreign Currency Derivative Contracts (Details) - Not Designated as Hedging Instrument $ in Thousands	Sep. 30, 2016 USD ($) $ / € $ / £ $ / NOK $ / CAD	Dec. 31, 2015 USD ($) $ / € $ / £ $ / NOK $ / CAD
Foreign currency contracts | Canadian dollar
Derivative [Line Items]
Notional Amount	$ 4,597	$ 5,091
Contractual Exchange Rate | $ / CAD	1.3052	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	$ 6,041	$ 11,498
Contractual Exchange Rate | $ / NOK	8.2766	8.6973
Foreign currency contracts | Pound sterling
Derivative [Line Items]
Notional Amount	$ 5,702	$ 7,516
Contractual Exchange Rate | $ / £	1.3260	1.5031
Foreign currency contracts, settlement date December 13, 2016 | Euro
Derivative [Line Items]
Notional Amount	$ 4,280
Contractual Exchange Rate | $ / €	1.1264
Foreign currency contracts, settlement date October 14, 2016 | Euro
Derivative [Line Items]
Notional Amount	$ 2,304
Contractual Exchange Rate | $ / €	1.1240

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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