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STOCK-BASED COMPENSATION (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
STOCK-BASED COMPENSATION PLANS    
Shares of common stock available for grant under stock incentive plans 760,800us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant  
Restricted Stock    
Stock-Based Compensation    
Weighted average value (in dollars per share) $ 11.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 7.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Service period over which value of the shares is amortized to compensation expense 3 years  
Number of Nonvested Restricted Shares    
Outstanding at beginning of period (in shares) 520,195us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
243,124us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Awarded/Granted (in shares) 168,334us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
423,518us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Forfeited (in shares) (42,141)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
(3,181)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Vested (in shares) (158,710)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
(143,266)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Outstanding at end of period (in shares) 487,678us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
520,195us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Additional disclosures    
Compensation expense, net of forfeitures $ 1,541us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 927us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Unrecognized compensation expense 3,324us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Unrecognized compensation expense, expected to be recognized in next fiscal year $ 1,368amot_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptionsExpectedToRecognizedInYearOne
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Restricted Stock | Performance based vesting    
Number of Nonvested Restricted Shares    
Outstanding at beginning of period (in shares) 15,190us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ amot_VestingCriteriaAxis
= amot_VestingBasedOnPerformanceMember
10,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ amot_VestingCriteriaAxis
= amot_VestingBasedOnPerformanceMember
Awarded/Granted (in shares) 88,566us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ amot_VestingCriteriaAxis
= amot_VestingBasedOnPerformanceMember
58,909us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ amot_VestingCriteriaAxis
= amot_VestingBasedOnPerformanceMember
Performance criteria met (in shares) (92,583)amot_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberMetPerformanceCriteria
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ amot_VestingCriteriaAxis
= amot_VestingBasedOnPerformanceMember
(18,775)amot_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberMetPerformanceCriteria
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ amot_VestingCriteriaAxis
= amot_VestingBasedOnPerformanceMember
Forfeited (in shares) (5,281)amot_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodUponBoardOfDirectorsApproval
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ amot_VestingCriteriaAxis
= amot_VestingBasedOnPerformanceMember
(34,944)amot_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodUponBoardOfDirectorsApproval
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ amot_VestingCriteriaAxis
= amot_VestingBasedOnPerformanceMember
Outstanding at end of period (in shares) 5,892us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ amot_VestingCriteriaAxis
= amot_VestingBasedOnPerformanceMember
15,190us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ amot_VestingCriteriaAxis
= amot_VestingBasedOnPerformanceMember
Restricted Stock | Performance based vesting | 2013 Grants    
Number of Nonvested Restricted Shares    
Awarded/Granted (in shares)   58,909us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= amot_AwardsGrantedIn2013Member
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ amot_VestingCriteriaAxis
= amot_VestingBasedOnPerformanceMember
Restricted Stock | Performance based vesting | 2014 Grants    
Number of Nonvested Restricted Shares    
Awarded/Granted (in shares) 88,566us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= amot_AwardsGrantedIn2014Member
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ amot_VestingCriteriaAxis
= amot_VestingBasedOnPerformanceMember