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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dividend reinvestment plan, shares     100,383 106,437 123,880
Stock purchase and compensation plans, shares     783,661 433,271 435,571
Dividends to stockholders, per share $ 0.13 [1] $ 0.13 [1] $ 0.52 $ 0.52 $ 0.52
Acquisition of treasury stock, shares     149,997 107,425 191,858
Preferred stock, par or stated value per share $ 0 $ 0 $ 0 $ 0 $ 0
Preferred stock, shares authorized 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000
Preferred stock, shares issued 0 0 0 0 0
Series A Preferred Stock [Member]
          
Preferred stock, par or stated value per share $ 0 $ 0 $ 0 $ 0 $ 0
Preferred stock, shares authorized 300,000 300,000 300,000 300,000 300,000
[1] 2 See Note 10. "Indebtedness" for a discussion of dividend restrictions.