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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current Assets:    
Receivables, allowance for doubtful accounts $ 784us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 651us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Property and Equipment, accumulated depreciation 241,295us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 220,064us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Capitalized Software, accumulated amortization $ 218,514us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization $ 180,062us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization
Equity:    
Series Preferred stock, par value $ 0.05us-gaap_PreferredStockParOrStatedValuePerShare $ 0.05us-gaap_PreferredStockParOrStatedValuePerShare
Series Preferred stock, shares authorized 50,000us-gaap_PreferredStockSharesAuthorized 50,000us-gaap_PreferredStockSharesAuthorized
Series Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Series Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 750,000,000us-gaap_CommonStockSharesAuthorized 750,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 166,688,000us-gaap_CommonStockSharesIssued 169,242,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 166,668,000us-gaap_CommonStockSharesOutstanding 169,242,000us-gaap_CommonStockSharesOutstanding