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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
CONDENSED CONSOLIDATED BALANCE SHEETS    
Accounts receivable, allowance for doubtful accounts (in dollars) $ 1,902us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 1,707us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Deposits and other assets, restricted (in dollars) 380ccoi_DepositsAndOtherRestrictedAssetsNoncurrent 389ccoi_DepositsAndOtherRestrictedAssetsNoncurrent
Senior secured notes, premium (in dollars)   $ 4,230us-gaap_DebtInstrumentUnamortizedPremium
Common stock, par value (in dollars per share) $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 75,000,000us-gaap_CommonStockSharesAuthorized 75,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 46,194,626us-gaap_CommonStockSharesIssued 46,398,729us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 46,194,626us-gaap_CommonStockSharesOutstanding 46,398,729us-gaap_CommonStockSharesOutstanding