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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Consolidated Balance Sheets [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 10,300us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 8,133us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Common stock, par value $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 220,000,000us-gaap_CommonStockSharesAuthorized  
Common stock, shares issued 112,233,000us-gaap_CommonStockSharesIssued 103,818,000us-gaap_CommonStockSharesIssued
Treasury stock, shares 709,000us-gaap_TreasuryStockShares 600,000us-gaap_TreasuryStockShares