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Basis of Presentation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Income Tax Expense Decrease Resulting from State Tax Legislation $ 11.5af_IncomeTaxExpenseDecreaseResultingFromStateTaxLegislation  
Deferred tax assets, net, increase resulting from state tax legislation 11.5af_DeferredTaxAssetsNetIncreaseResultingFromStateTaxLegislation  
Deferred tax asset valuation allowance   $ 7.2us-gaap_DeferredTaxAssetsValuationAllowance