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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
CONSOLIDATED BALANCE SHEETS
Common stock, par value	$ 0.00us-gaap_CommonStockNoParValue	$ 0.00us-gaap_CommonStockNoParValue
Common stock, shares authorized	500,000us-gaap_CommonStockSharesAuthorized	500,000us-gaap_CommonStockSharesAuthorized
Common, shares issued	271,579us-gaap_CommonStockSharesIssued	264,913us-gaap_CommonStockSharesIssued
Common, shares outstanding	271,579us-gaap_CommonStockSharesOutstanding	264,913us-gaap_CommonStockSharesOutstanding
Exchangeable, shares issued	28,521mux_ExchangeableCommonStockSharesIssued	32,246mux_ExchangeableCommonStockSharesIssued
Exchangeable, shares outstanding	28,521us-gaap_CommonStockOtherSharesOutstanding	32,246us-gaap_CommonStockOtherSharesOutstanding

X

- Definition

This element represents total number of exchangeable common shares that have been issued to shareholders.

+ References

No definition available.

+ Details

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X

- Definition

Face amount per share of no-par value common stock.

+ References

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- Definition

Total number of shares of other common stock instruments held by shareholders, such as exchangeable shares. May be all or portion of the number of common shares authorized.

+ References

No definition available.

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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