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CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement Of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 3,537us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 3,546us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred stock, par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, authorized 1,000,000us-gaap_PreferredStockSharesAuthorized 1,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, authorized 300,000,000us-gaap_CommonStockSharesAuthorized 300,000,000us-gaap_CommonStockSharesAuthorized
Common stock, issued 189,265,286us-gaap_CommonStockSharesIssued 189,262,876us-gaap_CommonStockSharesIssued
Common stock, outstanding 146,446,701us-gaap_CommonStockSharesOutstanding 146,444,291us-gaap_CommonStockSharesOutstanding
Treasury stock, shares 42,818,585us-gaap_TreasuryStockShares 42,818,585us-gaap_TreasuryStockShares