Segment Reporting (Reconciliation of Assets from Segment to Consolidated) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Segment Reporting, Asset Reconciling Item
Total Assets	$ 1,118,482	$ 1,098,021
Apex
Segment Reporting, Asset Reconciling Item
Total Assets	664,284	642,594
Oxford
Segment Reporting, Asset Reconciling Item
Total Assets	240,911	231,211
Life Sciences and Healthcare
Segment Reporting, Asset Reconciling Item
Total Assets	132,008	139,601
Physician
Segment Reporting, Asset Reconciling Item
Total Assets	$ 81,279	$ 84,615