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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock	Accumulated Other Comprehensive (Loss) Income	Accumulated Deficit	Total
Balance at Dec. 31, 2013	$ 1,354,696us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	$ (295)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	$ (607,634)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ 746,767us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2013	297,159,000us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Increase (Decrease) in Shareholders' Equity
Stock-based compensation	380us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember			380us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Unrealized (loss) gain on available-for-sale securities, net of taxes		1us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember		1us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Net income			17,887us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	17,887us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Balance at Mar. 31, 2014	1,355,076us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(294)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	(589,747)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	765,035us-gaap_StockholdersEquity
Balance (in shares) at Mar. 31, 2014	297,159,000us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Balance at Dec. 31, 2014	1,360,668us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	124us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	(919,577)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	441,215us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2014	300,100,000us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Increase (Decrease) in Shareholders' Equity
Shares issued for settlement of accounts payable	443us-gaap_StockIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember			443us-gaap_StockIssuedDuringPeriodValueIssuedForServices
Shares issued for settlement of accounts payable (in shares)	430,295mux_SharesIssuedDuringPeriodSharesIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock-based compensation	409us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember			409us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Unrealized (loss) gain on available-for-sale securities, net of taxes		(165)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember		(165)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Net income			6,021us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	6,021us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Balance at Mar. 31, 2015	$ 1,361,520us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	$ (41)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	$ (913,556)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ 447,923us-gaap_StockholdersEquity
Balance (in shares) at Mar. 31, 2015	300,530,000us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember

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Value of shares issued in lieu of cash for services contributed to the entity. Value of the shares issued includes, but is not limited to, services contributed by vendors and founders.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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