XML 88 R60.htm IDEA: XBRL DOCUMENT
v3.6.0.2

INCOME TAXES - Changes to Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Valuation allowance |  |  |
Change in valuation allowance | $ 11,100 |  |
Balance at Beginning of Period | 122,768 | $ 129,794 | $ 125,202
Additions | 1,430 | 6,873 | 11,514
Deductions | (12,577) | (13,899) | (6,922)
Balance at End of Period | $ 111,621 | $ 122,768 | $ 129,794

X
- Definition Amount of decrease in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
Name: | mux_ValuationAllowanceDeferredTaxAssetDecreaseAmount
Namespace Prefix: | mux_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
Name: | mux_ValuationAllowanceDeferredTaxAssetIncreaseAmount
Namespace Prefix: | mux_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_ValuationAllowanceAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e32123-109318 + Details
Name: | us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration