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Common Stock (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2008
Mar. 31, 2009
Common Stock (Textual) [Abstract]          
Common stock authorized by the Board of Directors       2,250,000  
Additional estimated shares       50,000  
Repurchase of common stock         1,200,000
Maximum percentage of repurchase of common stock         10.00%
Total purchased shares 0 254,642 86,522    
Cost of shares repurchased   $ 4.7 $ 1.4    
Remaining shares purchased under these programs 390,000