Property and Equipment - Net (Details Textual) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Property and Equipment - Net (Textual) [Abstract]    
Equipment under capital lease obligations $ 22,578 $ 17,113
Accumulated depreciation of equipment under capital leases 11,400 8,812
Capital lease obligations [Member]
   
Property and Equipment - Net (Textual) [Abstract]    
Accumulated depreciation of equipment under capital leases 1,519 687
Computer equipment [Member]
   
Property and Equipment - Net (Textual) [Abstract]    
Equipment under capital lease obligations 16,640 13,032
Computer equipment [Member] | Capital lease obligations [Member]
   
Property and Equipment - Net (Textual) [Abstract]    
Equipment under capital lease obligations $ 5,882 $ 3,442