Balance Sheet Components (Components Of Other Current Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Balance Sheet Components [Abstract]
Accrued variable compensation	$ 10,272	$ 9,846
Deferred revenues	2,771	2,974
Payroll related costs	2,682	1,193
Accrued subcontractor fees	2,269	2,294
Accrued medical claims expense	1,153	1,145
Acquired liabilities	1,188	64
Other current liabilities	4,616	3,089
Estimated fair value of contingent consideration liability (Note 7)	1,431	0
Total	$ 26,382	$ 20,605