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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Receivables, allowance for doubtful accounts $ 41,051us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 39,292us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Other intangible assets, accumulated amortization $ 36,917us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization $ 33,325us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Preferred stock, par value $ 0.10us-gaap_PreferredStockParOrStatedValuePerShare $ 0.10us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 20,000,000us-gaap_PreferredStockSharesAuthorized 20,000,000us-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 $ 0.10us-gaap_CommonStockParOrStatedValuePerShare $ 0.10us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 480,000,000us-gaap_CommonStockSharesAuthorized 480,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 178,621,000us-gaap_CommonStockSharesIssued 179,030,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 146,458,000us-gaap_CommonStockSharesOutstanding 150,197,000us-gaap_CommonStockSharesOutstanding
Treasury stock, shares 32,163,000us-gaap_TreasuryStockShares 28,833,000us-gaap_TreasuryStockShares