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Segment Reporting (Reconciliation of Assets from Segment to Consolidated) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Segment Reporting, Asset Reconciling Item    
Total Assets $ 1,089,033 $ 1,098,021
Apex
   
Segment Reporting, Asset Reconciling Item    
Total Assets 652,295 642,594
Oxford
   
Segment Reporting, Asset Reconciling Item    
Total Assets 238,724 231,211
Life Sciences and Healthcare
   
Segment Reporting, Asset Reconciling Item    
Total Assets 117,315 139,601
Physician
   
Segment Reporting, Asset Reconciling Item    
Total Assets $ 80,699 $ 84,615