Segment and Geographical Information - Schedule of Long Lived Assets by Geographical Areas (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Total consolidated assets	$ 366,135	$ 382,127
Reportable Geographical Components [Member] | United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total consolidated assets	195,708	213,912
Reportable Geographical Components [Member] | International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total consolidated assets	$ 170,427	$ 168,215