Segment Reporting (Reconciliation of Assets from Segment to Consolidated) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Segment Reporting, Asset Reconciling Item
Total Assets	$ 1,098,935	$ 410,665
Apex
Segment Reporting, Asset Reconciling Item
Total Assets	659,150	0
Oxford
Segment Reporting, Asset Reconciling Item
Total Assets	228,555	218,810
Life Sciences and Healthcare
Segment Reporting, Asset Reconciling Item
Total Assets	130,061	107,915
Physician
Segment Reporting, Asset Reconciling Item
Total Assets	$ 81,169	$ 83,940