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Compensation Plans (Deferred Stock) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Compensation expense $ 500 $ 500 $ 300
Non-employee directors [Member] | April 2011 [Member]
     
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Deferred stock awards issued     12,902
Non-employee directors [Member] | April 2012 [Member]
     
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Deferred stock awards issued   9,487  
Non-employee directors [Member] | April 2013 [Member]
     
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Deferred stock awards issued 4,542   17,331
Non-employee directors [Member] | April 2014 [Member]
     
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Deferred stock awards issued   12,744  
Non-employee directors [Member] | April 2015 [Member]
     
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Deferred stock awards issued 6,102