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Deferred Compensation Plan (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Percentage of salary the participants may defer 50.00%bas_DeferredCompensationArrangementPercentageOfSalaryEmployeesMayDefer    
Percentage of cash bonuses the participants may defer 100.00%bas_DeferredCompensationArrangementPercentageOfCashBonusesEmployeesMayDefer    
Maximum matching contributions per year $ 10,000bas_DeferredCompensationArrangementMaximumMatchingContributions    
Employer matching contributions and earnings, vesting schedule 5 years    
Employer contributions to deferred compensation plan $ 665,000us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution $ 996,000us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution $ 687,000us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
First 3% Of The Participant's Deferred Pay      
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Percentage of matching contribution 100.00%bas_DeferredCompensationArrangementMatchingContributionPercentage
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= bas_FirstThreePercentOfParticipantSDeferredPayMember
   
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= bas_FirstThreePercentOfParticipantSDeferredPayMember
   
Next 2% Of The Participant's Deferred Pay      
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Percentage of matching contribution 50.00%bas_DeferredCompensationArrangementMatchingContributionPercentage
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= bas_NextTwoPercentOfParticipantSDeferredPayMember
   
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 2.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= bas_NextTwoPercentOfParticipantSDeferredPayMember