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      <ShortName>Rate &amp; Regulatory Matters (Details)</ShortName>
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      <LongName>009210 - Disclosure - Fair Value Measurements (Details)</LongName>
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  <Logs>
    <Log type="Info">'Monetary' elements on report '009050 - Disclosure - Acquisition of Minnesota Limited, Inc. (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '009120 - Disclosure - Borrowing Arrangements (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Shares' elements on report '009140 - Disclosure - Earnings Per Share (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">Process Flow-Through: 001000 - Statement - Income Statement</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Dec. 31, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Jun. 30, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Mar. 31, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Dec. 31, 2010'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 2010'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Jun. 30, 2010'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Mar. 31, 2010'</Log>
    <Log type="Info">Process Flow-Through: 002000 - Statement - Balance Sheet</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2009'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2008'</Log>
    <Log type="Info">Process Flow-Through: 002010 - Statement - Balance Sheet (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 003000 - Statement - Statement of Cash Flows</Log>
    <Log type="Info">Process Flow-Through: 004010 - Statement - Statement of Shareholders' Equity (Parenthetical)</Log>
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