Commitments and Contingencies (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012 sqft	Sep. 30, 2011	Sep. 30, 2012 sqft	Sep. 30, 2011
Commitments and Contingencies (Textual) [Abstract]
Rent expense	$ 1,200,000	$ 600,000	$ 3,000,000	$ 2,300,000
Operating lease term			8 years
Office building area	94,543		94,543
Minimum lease payment	56,762,000		56,762,000
Commitments and Contingencies (Additional Textual) [Abstract]
Termination fee				700,000
Lease commitments			10,200,000
Cease-use loss			200,000
Office space leased area for first year			17,857
Facility Closing [Member]
Commitments and Contingencies (Textual) [Abstract]
Facility exit obligation	3,000,000		3,000,000
Cost of revenues [Member]
Commitments and Contingencies (Textual) [Abstract]
Rent expense	3,500,000	1,700,000	9,200,000	4,400,000
Building [Member]
Commitments and Contingencies (Textual) [Abstract]
Minimum lease payment	13,700,000		13,700,000
Office Space [Member]
Commitments and Contingencies (Textual) [Abstract]
Operating lease term			10 years 6 months
Office building area	43,590		43,590
Minimum lease payment	$ 14,000,000		$ 14,000,000