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Short-Term Borrowing (Details Textual) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 22, 2012
Short Term Borrowing (Textual) [Abstract]    
Short-term credit facility 0  
Previous Maximum Borrowing Capacity   100
Short-term loan maximum borrowing capacity   140
Maximum Aggregate Short Term Borrowing Authorized by our Board of Directors   85
Revolving Credit Note [Member]
    
Short Term Borrowing (Textual) [Abstract]    
Short-term credit facility   40
Credit facility maturing date Jun. 01, 2013  
Previous Maximum Borrowing Capacity   50
Short-term loan maximum borrowing capacity   $ 90
Revolving Credit Note [Member] | LIBOR [Member]
    
Short Term Borrowing (Textual) [Abstract]    
Short-term credit facility, interest description LIBOR plus 80 basis points  
Short-term credit facility, base rate   0.80%
Revolving Credit Note [Member] | Lender's Base Rate [Member]
    
Short Term Borrowing (Textual) [Abstract]    
Short-term credit facility, interest description lender’s Base Rate plus 80 basis points  
Short-term credit facility, base rate   0.80%