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Stock Option Plans (Nonvested Options) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]      
Nonvested options, Number of Shares, beginning balance 423,327metr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumberOfSharesBeginningBalance    
Nonvested options, Granted 116,990us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 126,571us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 241,575us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Nonvested options, Vested (178,135)us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares    
Nonvested options, Forfeited (26,378)us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares    
Nonvested options, Number of Shares, ending balance 335,804metr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumberOfSharesEndingBalance    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Nonvested options, Weighted Average Grant Date Fair Value, beginning balance   $ 6.59metr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageExercisePriceBeginningBalance  
Nonvested options, Granted, Weighted Average Grant Date Fair Value $ 7.72us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue    
Nonvested options, Vested, Weighted Average Grant Date Fair Value $ 6.60us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue    
Nonvested options, Forfeited, Weighted Average Grant Date Fair Value $ 6.56us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue    
Nonvested options, Weighted Average Grant Date Fair Value, ending balance $ 6.98metr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageExercisePriceEndingBalance