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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Allowances for accounts receivable $ 124,606us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 113,357us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 1,725,000us-gaap_PreferredStockSharesIssued 1,725,000us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 1,725,000us-gaap_PreferredStockSharesOutstanding 1,725,000us-gaap_PreferredStockSharesOutstanding
Common stock, shares authorized 70,000,000us-gaap_CommonStockSharesAuthorized 70,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, Shares, Issued 70,000,000us-gaap_CommonStockSharesIssued 70,000,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 48,413,000us-gaap_CommonStockSharesOutstanding 48,113,000us-gaap_CommonStockSharesOutstanding