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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Property and Equipment (Textual) [Abstract]        
Capital Expenditure, Additions, During the period $ 29.8 $ 22.5 $ 89.1 $ 34.5