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Represents the maximum period for impairment of investments in available-for-sale securities.

+ Details

Name:	aem_AvailableForSaleSecuritiesMaximumPeriodOfImpairment
Namespace Prefix:	aem
Data Type:	xbrli:integerItemType
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- Definition

This item represents the gross unrealized gains and losses for securities which are categorized neither as held-to-maturity nor trading securities. Such gross unrealized gains or losses are the excess or falls short of the fair value of the Available-for-sale Securities over their carrying value.

+ Details

Name:	aem_AvailableForSaleSecuritiesUnrealizedGainsLossesGross
Namespace Prefix:	aem
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the percentage of total fair value of investments in unrealized loss position, which is equal to the fair value of portfolio of common shares in the mining industry.

+ Details

Name:	aem_PercentageOfTotalFairValueOfInvestmentsInUnrealizedLossPosition
Namespace Prefix:	aem
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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 7
-Footnote 2

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 19

+ Details

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- Definition

This item represents equity securities categorized neither as held-to-maturity nor trading which are intended to be sold within one year from the balance sheet date or the normal operating cycle, whichever is longer. Equity securities represent ownership interests or the right to acquire ownership interests in corporations and other legal entities which ownership interest is represented by shares of common or preferred stock (which is not mandatorily redeemable or redeemable at the option of the holder), convertible securities, stock rights, or stock warrants. Such securities are reported at fair value; unrealized gains and losses related to Available-for-sale securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 3
-Section A
-Paragraph 4, 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13, 17

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 3
-Subparagraph c

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 16

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 22

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 21
-Subparagraph a

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 16
-Subparagraph a

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 18

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 15

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 16
-Subparagraph b

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- 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.

+ Details

Name:	us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix:	us-gaap
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Period Type:	duration

AVAILABLE-FOR-SALE SECURITIES (Details) (USD $)	3 Months Ended		6 Months Ended
AVAILABLE-FOR-SALE SECURITIES (Details) (USD $)	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
AVAILABLE-FOR-SALE SECURITIES
Proceeds from sale of available-for-sale securities	$ 500,000		$ 9,300,000	$ 500,000
Gain on sale of available-for-sale securities	420,000		4,814,000	346,000
Schedule of Available-for-sale Securities
Estimated fair value	100,654,000	99,109,000	100,654,000	99,109,000	99,109,000
Available-for-sale securities in an unrealized gain position
Schedule of Available-for-sale Securities
Cost	47,689,000		47,689,000		50,958,000
Unrealized gains (losses) in accumulated other comprehensive income	48,381,000		48,381,000		48,151,000
Estimated fair value	96,070,000		96,070,000		99,109,000
Available-for-sale securities in an unrealized loss position
Schedule of Available-for-sale Securities
Cost	6,038,000		6,038,000
Unrealized gains (losses) in accumulated other comprehensive income	(1,454,000)		(1,454,000)
Estimated fair value	$ 4,584,000		$ 4,584,000
Percentage of total fair value of investments in unrealized loss position (as a percent)	5.00%		5.00%
Duration of impairment for investments in available-for-sale securities (in months)			3