Subsequent Events (Details) (Subsequent Event, USD $) In Millions, unless otherwise specified	0 Months Ended	1 Months Ended
	Oct. 15, 2012 Lease Agreement renewal_option sqft	Oct. 31, 2012 Share Repurchase Program - October 2012 Maximum
Subsequent Event [Line Items]
Authorized amount for share repurchase program		$ 75
Square feet of leased space	56,218
Initial term of lease (in years, months, and days)	7 years 9 months 18 days
Annual rent in the initial year of lease agreement	1.2
Annual rent in the final year of lease agreement	$ 1.4
Number of renewal options	2
Term of renewal options (years)	5 years