Indemnification Asset (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
A summary of the activity in the balance of indemnification asset
Beginning balance	$ 3,405	$ 6,689	$ 4,405	$ 5,640
Effect of actual covered losses and change in estimated future covered losses	680	204	328	1,885
Reimbursable expenses (revenue), net	18	(19)	10	103
Payments received	(57)	(2,329)	(697)	(3,083)
Ending balance	$ 4,046	$ 4,545	$ 4,046	$ 4,545