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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Trade accounts receivable-billed, allowance $ 3,323us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 2,359us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Property and equipment, accumulated depreciation 138,065us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 129,522us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Long-term debt, unamortized original issue discount 14,169us-gaap_DebtInstrumentUnamortizedDiscount 19,950us-gaap_DebtInstrumentUnamortizedDiscount
Preferred stock, par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-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 $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares reserved for employee stock purchase plan and stock incentive plans 6,032,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance 5,441,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Common stock warrants, outstanding 33,945,000us-gaap_CommonStockSharesOutstanding 33,745,000us-gaap_CommonStockSharesOutstanding
Treasury stock, shares 32,763,000us-gaap_TreasuryStockShares 32,030,000us-gaap_TreasuryStockShares
Software    
Accumulated amortization 86,797us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember		 77,504us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Client contracts    
Accumulated amortization $ 88,585us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerContractsMember		 $ 75,382us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerContractsMember
Common stock warrant    
Common stock warrants, issued 2,851,000us-gaap_CommonStockSharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		 0us-gaap_CommonStockSharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
Common stock warrants, outstanding 2,851,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		 0us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember