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Commitments and Contingencies (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Long-term Debt      
2013 $ 10,000,000    
2014 10,000,000    
2015 10,000,000    
2016 10,875,000    
2017 99,750,000    
Thereafter 259,188,000    
Total 399,813,000    
Operating Leases      
2013 15,685,000    
2014 13,863,000    
2015 11,236,000    
2016 7,523,000    
2017 5,351,000    
Thereafter 8,699,000    
Total 62,357,000    
Related Party      
2013 1,299,000    
2014 1,168,000    
2015 694,000    
2016 175,000    
2017 0    
Thereafter 0    
Total 3,336,000    
Total      
2013 16,984,000    
2014 15,031,000    
2015 11,930,000    
2016 7,698,000    
2017 5,351,000    
Thereafter 8,699,000    
Total 65,693,000    
Deferred rent liability, current 400,000 300,000  
Deferred rent liability, noncurrent 3,600,000 3,800,000  
Rent expense 16,600,000 12,800,000 7,200,000
Workers' compensation and medical malpractice liability, current 32,751,000 26,769,000  
Letters of credit outstanding 2,700,000 2,800,000  
Business Acquisition, Contingent Consideration, Potential Cash Payment 16,000,000    
Income tax reserve in other long-term liabilities 1,600,000 400,000  
Other Liabilities, Current 27,906,000 21,437,000  
Pending Litigation [Member]
      
Total      
Other Liabilities, Current $ 2,100,000    
Apex Systems
      
Total      
Number of leased properties owned by related parties (in number of properties) 2