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Leases (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases [Abstract]      
Remaining term of operating leases (in years) 7 years    
Total rental expense under operating leases $ 2,800,000us-gaap_OperatingLeasesRentExpenseNet $ 4,600,000us-gaap_OperatingLeasesRentExpenseNet $ 4,800,000us-gaap_OperatingLeasesRentExpenseNet
Minimum future operating lease payments [Abstract]      
2015 1,041,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 1,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 467,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 231,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 and thereafter 497,000mtg_OperatingLeasesFutureMinimumPaymentsYearFourAndThereafter    
Total $ 3,236,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue