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Income Taxes (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Line Items]      
Income Taxes Paid $ 2,600,000us-gaap_IncomeTaxesPaid $ 1,500,000us-gaap_IncomeTaxesPaid $ 2,400,000us-gaap_IncomeTaxesPaid
Federal statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
Valuation allowance 0us-gaap_DeferredTaxAssetsValuationAllowance 0us-gaap_DeferredTaxAssetsValuationAllowance  
Net operating loss carryforwards 99,300,000us-gaap_OperatingLossCarryforwards    
Federal      
Income Taxes [Line Items]      
Income Taxes Paid $ 1,900,000us-gaap_IncomeTaxesPaid
/ us-gaap_IncomeTaxAuthorityAxis
= bas_FederalMember
  $ 601,000us-gaap_IncomeTaxesPaid
/ us-gaap_IncomeTaxAuthorityAxis
= bas_FederalMember