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Derivatives - Foreign Currency Derivative Contracts (Details) - Not Designated as Hedging Instrument $ in Thousands	Jun. 30, 2017 USD ($) $ / £ $ / € $ / NOK $ / CAD	Dec. 31, 2016 USD ($) $ / £ $ / € $ / NOK $ / CAD
Foreign currency contracts | Canadian dollar
Derivative [Line Items]
Notional Amount	$ 6,040	$ 4,553
Contractual Exchange Rate | $ / CAD	1.3245	1.3179
Foreign currency contracts | Euro
Derivative [Line Items]
Notional Amount	$ 7,747	$ 4,753
Contractual Exchange Rate | $ / €	1.1227	1.0563
Foreign currency contracts | Norwegian krone
Derivative [Line Items]
Notional Amount	$ 9,472	$ 3,643
Contractual Exchange Rate | $ / NOK	8.4461	8.5101
Foreign currency contracts | Pound sterling
Derivative [Line Items]
Notional Amount	$ 11,479	$ 3,908
Contractual Exchange Rate | $ / £	1.2755	1.2607
Foreign currency contracts, settled January 13, 3017 | Euro
Derivative [Line Items]
Notional Amount		$ 2,558
Contractual Exchange Rate | $ / €		1.0659
Foreign currency contracts, settled July 14, 2017 | Euro
Derivative [Line Items]
Notional Amount	$ 2,260
Contractual Exchange Rate | $ / €	1.1302

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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