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Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Allowance For Bad Debt | $ 15,961 us-gaap_AllowanceForDoubtfulAccountsReceivable | $ 14,856 us-gaap_AllowanceForDoubtfulAccountsReceivable
Preferred stock - par value per share | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock - authorized shares | 10,000,000 us-gaap_PreferredStockSharesAuthorized | 10,000,000 us-gaap_PreferredStockSharesAuthorized
Common Stock, Par or Stated Value Per Share | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare
Common stock - authorized shares | 125,000,000 us-gaap_CommonStockSharesAuthorized | 125,000,000 us-gaap_CommonStockSharesAuthorized
Common stock - issued shares | 44,786,011 us-gaap_CommonStockSharesIssued | 44,786,011 us-gaap_CommonStockSharesIssued
Common stock - outstanding shares | 28,243,007 us-gaap_CommonStockSharesOutstanding | 29,487,075 us-gaap_CommonStockSharesOutstanding
Treasury shares | 16,543,004 us-gaap_TreasuryStockShares | 15,298,936 us-gaap_TreasuryStockShares

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