Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment (Details Textual)

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Property and Equipment (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Property and Equipment (Textual) [Abstract]    
Capital Expenditure, Additions, During the period $ 59.3 $ 12.0