Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

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- 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.

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Derivatives (Currency Contracts) (Details) $ in Thousands, CAD in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 CAD	Dec. 31, 2014 CAD
Derivative [Line Items]
Gain (loss) on derivatives not designated as hedging instruments	$ (361)	$ (187)	$ (287)	$ (187)
Other Income (Expense) [Member] \| Currency contracts [Member]
Derivative [Line Items]
Gain (loss) on derivatives not designated as hedging instruments	$ (361)	$ (187)	$ (287)	$ (187)
Not Designated as Hedging Instrument [Member] \| Currency contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount \| CAD					CAD 6.5	CAD 6.3