Segment Reporting (Reconciliation of Assets from Segment to Consolidated) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Segment Reporting, Asset Reconciling Item
Total Assets	$ 1,093,436	$ 1,098,021
Apex
Segment Reporting, Asset Reconciling Item
Total Assets	647,463	642,594
Oxford
Segment Reporting, Asset Reconciling Item
Total Assets	235,846	231,211
Life Sciences and Healthcare
Segment Reporting, Asset Reconciling Item
Total Assets	127,431	139,601
Physician
Segment Reporting, Asset Reconciling Item
Total Assets	$ 82,696	$ 84,615