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Derivatives and Financial Instruments (Narrative) (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Financial instruments and derivative contracts (Textual) [Abstract]
Percentage of derivative contract volume expiring within twelve months	99.00%	99.00%

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- Definition

Estimated percentage of derivative contract volume expiring within twelve months

+ References

No definition available.

+ Details

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- Definition

Financial instruments and derivative contracts.

+ References

No definition available.

+ Details

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