Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Annual future minimum payments under these operating leases
Remaining three months ended December 31, 2012	$ 3,898
2013	13,569
2014	10,476
2015	5,383
2016	5,044
Thereafter	18,392
Total minimum lease payments	56,762
Data Centers [Member]
Annual future minimum payments under these operating leases
Remaining three months ended December 31, 2012	2,982
2013	8,174
2014	5,314
2015	546
Total minimum lease payments	17,016
Office Leases [Member]
Annual future minimum payments under these operating leases
Remaining three months ended December 31, 2012	916
2013	5,395
2014	5,162
2015	4,837
2016	5,044
Thereafter	18,392
Total minimum lease payments	$ 39,746