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Leases (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases [Abstract]      
Rent expense $ 3,700,000us-gaap_OperatingLeasesRentExpenseNet $ 3,500,000us-gaap_OperatingLeasesRentExpenseNet $ 3,700,000us-gaap_OperatingLeasesRentExpenseNet
Liability related to rent escalations 1,100,000us-gaap_AccruedRentCurrentAndNoncurrent 1,000,000us-gaap_AccruedRentCurrentAndNoncurrent  
Allowance for moving expenses and tenant improvements 1,500,000ueic_OperatingLeasesAllowanceForMovingExpensesAndTenantImprovements    
Future minimum non-cancelable operating lease payments      
2015 3,035,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 2,585,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 2,179,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 1,662,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 886,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 2,591,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total operating lease commitments $ 12,938,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Property subject to rent escalations | Minimum [Member]      
Operating Leased Assets [Line Items]      
Term of lease 48 months    
Property subject to rent escalations | Maximum [Member]      
Operating Leased Assets [Line Items]      
Term of lease 125 months    
Corporate headquarters      
Operating Leased Assets [Line Items]      
Term of lease 125 months