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CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets    
Allowance for doubtful accounts $ 2,888us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 2,719us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accumulated amortization $ 761us-gaap_AccumulatedAmortizationOfCurrentDeferredFinanceCosts $ 378us-gaap_AccumulatedAmortizationOfCurrentDeferredFinanceCosts
Stockholders' equity    
Convertible preferred stock, par value $ 0.01dhx_ConvertiblePreferredStockParValue $ 0.01dhx_ConvertiblePreferredStockParValue
Convertible Preferred Stock, Shares Authorized 20,000,000dhx_ConvertiblePreferredSharesAuthorized 20,000,000dhx_ConvertiblePreferredSharesAuthorized
Convertible preferred, shares outstanding 0dhx_ConvertiblePreferredSharesOutstanding 0dhx_ConvertiblePreferredSharesOutstanding
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 240,000,000us-gaap_CommonStockSharesAuthorized 240,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 77,366,000us-gaap_CommonStockSharesIssued 73,414,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 54,142,000us-gaap_CommonStockSharesOutstanding 54,634,000us-gaap_CommonStockSharesOutstanding
Treasury stock, shares 23,224,000us-gaap_TreasuryStockShares 18,780,000us-gaap_TreasuryStockShares