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Derivatives - Foreign Currency Derivative Contracts (Details) - Not Designated as Hedging Instrument $ in Thousands	Dec. 31, 2016 USD ($) $ / € $ / CAD $ / £ $ / NOK	Dec. 31, 2015 USD ($) $ / € $ / CAD $ / £ $ / NOK
Canadian dollar | Foreign currency contracts, settlement date March 14, 2017
Derivative [Line Items]
Notional amount	$ 4,553
Contractual exchange rate (percent) | $ / CAD	1.3179
Canadian dollar | Foreign currency contracts, settlement date January 13, 2016
Derivative [Line Items]
Notional amount		$ 5,091
Contractual exchange rate (percent) | $ / CAD		1.3751
Euro | Foreign currency contracts, settlement date March 14, 2017
Derivative [Line Items]
Notional amount	$ 4,753
Contractual exchange rate (percent) | $ / €	1.0563
Euro | Foreign currency contracts, settlement date January 13, 2017
Derivative [Line Items]
Notional amount	$ 2,558
Contractual exchange rate (percent) | $ / €	1.0659
Euro | Foreign currency contracts, settlement date January 13, 2016
Derivative [Line Items]
Notional amount		$ 19,706
Contractual exchange rate (percent) | $ / €		1.0948
Norwegian kroner | Foreign currency contracts, settlement date March 14, 2017
Derivative [Line Items]
Notional amount	$ 3,643
Contractual exchange rate (percent) | $ / NOK	8.5101
Norwegian kroner | Foreign currency contracts, settlement date January 13, 2016
Derivative [Line Items]
Notional amount		$ 11,498
Contractual exchange rate (percent) | $ / NOK		8.6973
Pound sterling | Foreign currency contracts, settlement date March 14, 2017
Derivative [Line Items]
Notional amount	$ 3,908
Contractual exchange rate (percent) | $ / £	1.2607
Pound sterling | Foreign currency contracts, settlement date January 13, 2016
Derivative [Line Items]
Notional amount		$ 7,516
Contractual exchange rate (percent) | $ / £		1.5031

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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