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Consolidated Condensed Balance Sheets (Current Period Unaudited) (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Trade accounts receivable, allowance for doubtful accounts (in Dollars) $ 4,987us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 5,475us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Total assets of variable interest entities(VIE) (in Dollars) 154,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets 155,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
Total liabilities of VIEs (in Dollars) $ 38,300us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities $ 42,500us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
Preferred stock, shares authorized 50,000,000us-gaap_PreferredStockSharesAuthorized 50,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Preferred stock par value (in Dollars per share) $ 0us-gaap_PreferredStockParOrStatedValuePerShare $ 0us-gaap_PreferredStockParOrStatedValuePerShare
Common stock, par value (in Dollars per share) $ 0us-gaap_CommonStockParOrStatedValuePerShare $ 0us-gaap_CommonStockParOrStatedValuePerShare
Voting Common Stock [Member]    
Common stock, shares authorized 400,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= meg_VotingCommonStockMember		 400,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= meg_VotingCommonStockMember
Common stock, shares issued 130,325,543us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= meg_VotingCommonStockMember		 129,931,812us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= meg_VotingCommonStockMember