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Derivatives - Foreign Currency Derivative Contracts Outstanding (Details) - Not Designated as Hedging Instrument - Foreign currency contracts $ in Thousands	Jun. 30, 2018 USD ($) $ / $ $ / € $ / £ $ / kr	Dec. 31, 2017 USD ($) $ / $ $ / € $ / £ $ / kr
Canadian dollar
Derivative [Line Items]
Notional Amount	$ 5,904	$ 6,226
Contractual Exchange Rate | $ / $	1.3041	1.2850
Euro
Derivative [Line Items]
Notional Amount	$ 8,598	$ 5,326
Contractual Exchange Rate | $ / €	1.1777	1.1836
Norwegian krone
Derivative [Line Items]
Notional Amount	$ 5,233	$ 6,212
Contractual Exchange Rate | $ / kr	8.0266	8.3704
Pound sterling
Derivative [Line Items]
Notional Amount	$ 9,332	$ 6,039
Contractual Exchange Rate | $ / £	1.3331	1.3419

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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- Details

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- Details

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- Details

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- Details

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- Details

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