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Long Term Debt (Details Textual) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Promissory note payable to affiliate [Member]
 
Long-term debt (Textual) [Abstract]  
Repayment of aggregate amount on promissory note payable to affiliate $ 1.25
Repayment of long-term debt $ 1.0
Average interest rate on long-term debt 1.50%
Revolving bank credit facility [Member]
 
Long-term debt (Textual) [Abstract]  
Average interest rate on long-term debt 3.40%
Average interest rate on long-term debt 3.80%