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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
CONSOLIDATED BALANCE SHEETS    
Accounts receivable, allowance for doubtful accounts (in dollars) $ 4,257us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 4,379us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred stock, par value (in dollars per share) $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value (in dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 102,969,912us-gaap_CommonStockSharesAuthorized 102,969,912us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 41,123,365us-gaap_CommonStockSharesIssued 41,123,365us-gaap_CommonStockSharesIssued
Treasury stock, shares 3,816,216us-gaap_TreasuryStockShares 3,853,586us-gaap_TreasuryStockShares