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Notes Payable (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Bank
Jun. 30, 2011
Jun. 30, 2012
Bank
Jun. 30, 2011
Dec. 31, 2011
Notes payable (Textual) [Abstract]          
Notes payable $ 0   $ 0   $ 0
Capital investment 4.7   4.7    
Dividend received 0.1 0.1 0.1 0.1  
Unsecured revolving line of credit 60.0   60.0    
Line of credit outstanding $ 0   $ 0    
Debt instrument maturity date     Jun. 01, 2013    
Number of major commercial banks 2   2