Annual report pursuant to Section 13 and 15(d)

Stock Compensation Plans (Equity Grant Shares Awarded To Elected Or Re-elected Directors) (Details)

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Stock Compensation Plans (Equity Grant Shares Awarded To Elected Or Re-elected Directors) (Details)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Non- Restricted Stock Awards [Member]
      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Equity Grant Shares 1,850 3,963 7,788
Restricted Stock Awards [Member]
      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Equity Grant Shares 6,475 7,926 15,118
Deferred Stock Awards [Member]
      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Equity Grant Shares 1,850 1,321 2,596