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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
CONSOLIDATED BALANCE SHEETS
Common stock, par value	$ 0us-gaap_CommonStockNoParValue	$ 0us-gaap_CommonStockNoParValue
Common stock, shares authorized	500,000us-gaap_CommonStockSharesAuthorized	500,000us-gaap_CommonStockSharesAuthorized
Common, shares issued	272,956us-gaap_CommonStockSharesIssued	271,579us-gaap_CommonStockSharesIssued
Common, shares outstanding	272,956us-gaap_CommonStockSharesOutstanding	271,579us-gaap_CommonStockSharesOutstanding
Exchangeable, shares issued	27,574mux_ExchangeableCommonStockSharesIssued	28,521mux_ExchangeableCommonStockSharesIssued
Exchangeable, shares outstanding	27,574mux_ExchangeableCommonStockSharesOutstanding	28,521mux_ExchangeableCommonStockSharesOutstanding

X

- Definition

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

+ References

No definition available.

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This element represents total number of shares of exchangeable common stock held by shareholders.

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- Definition

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

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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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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.

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

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