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DERIVATIVE FINANCIAL INSTRUMENTS (Details) (Interest Rate Swaps, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Oct. 31, 2013
derivative
Dec. 31, 2014
Derivative financial instruments        
Number of derivative instruments     2us-gaap_DerivativeNumberOfInstrumentsHeld  
Notional amount of interest rate swap derivatives     $ 25,000invest_DerivativeNotionalAmount  
Ratio of notional amount to term loan (as a percent)     50.00%amot_DerivativeNotionalAmountRatioOnTermLoan  
Notional amount of interest rate swap derivatives at maturity     6,673amot_DerivativeNotionalAmountAtMaturity  
Amount hedged 21,000us-gaap_DerivativeAmountOfHedgedItem      
Hedge ineffectiveness recorded in earnings 0us-gaap_GainOnCashFlowHedgeIneffectiveness 0us-gaap_GainOnCashFlowHedgeIneffectiveness    
Estimated amount to be reclassified as an increase to interest expense 155us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred      
Effect of derivative financial instruments on the consolidated statement of income and comprehensive income        
Net deferral in OCI of derivatives (effective portion) (151)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet (68)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet    
Interest expense
       
Effect of derivative financial instruments on the consolidated statement of income and comprehensive income        
Net reclassification from AOCI into income (effective portion) (51)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
(58)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
   
Accrued liabilities.
       
Derivative financial instruments        
Interest rate swaps (102)us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
    (2)us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Total Liabilities
       
Derivative financial instruments        
Interest rate swaps $ (102)us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilitiesTotalMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
    $ (2)us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilitiesTotalMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember