Indemnification Asset (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
A summary of the activity in the balance of indemnification asset
Beginning balance	$ 4,046	$ 4,545	$ 4,405	$ 5,640
Effect of actual covered losses and change in estimated future covered losses	(87)	(292)	241	1,594
Reimbursable expenses (revenue), net	2	220	12	322
Payments received	(1,476)		(2,173)	(3,083)
Ending balance	$ 2,485	$ 4,473	$ 2,485	$ 4,473