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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 Plant and Equipment (Textual) [Abstract]        
Depreciation expense, inclusive of expense captured in cost of revenue $ 2.9 $ 2.3 $ 5.4 $ 4.4