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Incentive Plans (Details)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Incentive Plans [Abstract]      
Number of stock options outstanding (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Number of stock options granted (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross  
Common stock reserved for issuance [Line Items]      
Common shares reserved for issuance (in shares) 4,430us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized    
1993 Stock Incentive Plan [Member]      
Common stock reserved for issuance [Line Items]      
Common shares reserved for issuance (in shares) 4,320us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ abcp_CommonStockReservedForIssuanceAxis
= us-gaap_EmployeeStockOptionMember
   
Other employee benefit plan [Member]      
Common stock reserved for issuance [Line Items]      
Common shares reserved for issuance (in shares) 110us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ abcp_CommonStockReservedForIssuanceAxis
= us-gaap_OtherPensionPlansDefinedBenefitMember