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8. NOTES PAYABLE, LINE OF CREDIT AND CAPITAL LEASES (Tables)
12 Months Ended
Dec. 31, 2013
Debt Disclosure [Abstract]  
Schedule of notes payable, line of credit and capital lease obligations
   December 31, 
   2013   2012 
Revolving lines of credit  $   $33,000 
           
Senior secured term loan   385,325    349,125 
           
Senior unsecured notes   200,000    200,000 
           
Discounts on term loan and notes   (12,109)   (9,510)
           
Promissory notes payable to the former shareholders of businesses acquired at interest rates ranging from 4.0% to 6.0%, due through 2014   492    1,057 
           
Equipment notes payable at interest rates ranging from 7.1% to 11.7%, due through 2016, collateralized by medical equipment   2,064    1,040 
           
Obligations under capital leases at interest rates ranging from 10.0% to 11.7%, due through 2017, collateralized by medical and office equipment   5,854    7,695 
    581,626    582,407 
Less: current portion   (6,178)   (8,645)
   $575,448   $573,762 
Annual principal maturities of notes payable
2014  $5,361 
2015   4,576 
2016   4,319 
2017   3,900 
2018   569,725 
   $587,881 
Schedule of capital lease minimum payments
2014  $3,365 
2015   1,564 
2016   1,224 
2017   187 
Total minimum payments   6,340 
Amount representing interest   (486)
Present value of net minimum lease payments   5,854 
Less current portion   (3,075)
Long-term portion  $2,779