Accounts Receivable (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Schedule of Accounts receivable
Accounts receivable gross	$ 18,223	$ 15,716
Less allowance for doubtful accounts	(197)	(69)
Accounts receivable, net	18,026	15,647
Trade receivables [Member]
Schedule of Accounts receivable
Accounts receivable gross	12,534	11,128
Unpaid amounts for benefit services [Member]
Schedule of Accounts receivable
Accounts receivable gross	$ 5,689	$ 4,588