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Common Shareholders' Equity Common Shareholders' Equity - Additional Information (Details) (USD $)
0 Months Ended 3 Months Ended 36 Months Ended
Dec. 20, 2014
Dec. 31, 2014
Dec. 31, 2014
Dec. 20, 2011
Stockholders Equity Note [Line Items]        
Number of voting rights per share, common stock   $ 1uti_CommonStockNumberOfVotingRightsPerShare    
Common stock dividends declared, per share $ 0.10us-gaap_CommonStockDividendsPerShareCashPaid      
Cash dividend   $ 2,483,000us-gaap_DividendsCommonStockCash    
Repurchase of common stock authorized by Board of Directors       25,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Purchased shares     825,252us-gaap_StockRepurchasedDuringPeriodShares  
Average price per share     $ 10.50us-gaap_TreasuryStockAcquiredAverageCostPerShare  
Aggregate cost of treasury stock repurchased during the period     $ 8,700,000us-gaap_StockRepurchasedDuringPeriodValue