Indemnification Asset (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
A summary of the activity in the balance of indemnification asset
Beginning balance	$ 1,997	$ 4,405
Effect of actual covered losses and change in estimated future covered losses	(35)	(418)
Reimbursable (revenue) expenses, net	(39)	58
Payments received	(116)	(640)
Ending balance	$ 1,807	$ 3,405