Segment Reporting (Reconciliation of Assets from Segment to Consolidated) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Segment Reporting, Asset Reconciling Item
Total Assets	$ 1,094,748	$ 410,665
Apex
Segment Reporting, Asset Reconciling Item
Total Assets	658,380	0
Oxford
Segment Reporting, Asset Reconciling Item
Total Assets	225,355	218,810
Life Sciences and Healthcare
Segment Reporting, Asset Reconciling Item
Total Assets	127,145	107,915
Physician
Segment Reporting, Asset Reconciling Item
Total Assets	$ 83,868	$ 83,940