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Statements of Common Stockholders' Equity (Unaudited) (USD $)
In Thousands, except Share data
Common Stock [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2009$ 73,569$ 13,353$ 86,922
Balance (in shares) at Dec. 31, 200912,558,724  
Net income06,8536,853
Dividends0(4,845)(4,845)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans1,50801,508
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares)108,944  
Balance at Sep. 30, 201075,07715,36190,438
Balance (in shares) at Sep. 30, 201012,667,668  
Balance at Dec. 31, 201075,48115,77691,257
Balance (in shares) at Dec. 31, 201012,692,054 12,692,054
Net income06,9616,961
Dividends0(5,001)(5,001)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans1,23201,232
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares)75,729  
Balance at Sep. 30, 2011$ 76,713$ 17,736$ 94,449
Balance (in shares) at Sep. 30, 201112,767,783 12,767,783