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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
CONDENSED CONSOLIDATED BALANCE SHEETS    
Accounts receivable, allowance (in dollars) $ 4,419us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 8,605us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred stock, par value (in dollars per share) $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 50,000,000us-gaap_PreferredStockSharesAuthorized 50,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common stock, par value (in dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 250,000,000us-gaap_CommonStockSharesAuthorized 250,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 73,808,200us-gaap_CommonStockSharesIssued 72,500,773us-gaap_CommonStockSharesIssued
Treasury stock, common shares 4,963,013us-gaap_TreasuryStockShares 6,582,068us-gaap_TreasuryStockShares