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2. SIGNIFICANT ACCOUNTING POLICIES (Details - Revenue) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Service fee revenue, net of contractual allowances and discounts $ 219,416 $ 214,056 $ 423,584 $ 426,806
Provision for bad debts 0 (11,854) 0 (23,500)
Net service fee revenue 219,416 202,202 423,584 403,306
Revenue under capitation arrangements 24,979 27,812 52,203 55,721
Total net revenue 244,395 230,014 475,787 459,027
Commercial Insurance [Member]        
Service fee revenue, net of contractual allowances and discounts 145,538 142,691 281,981 283,683
Medicare [Member]        
Service fee revenue, net of contractual allowances and discounts 50,302 47,611 95,867 95,291
Medicaid [Member]        
Service fee revenue, net of contractual allowances and discounts 6,928 6,525 13,179 13,259
Workers' Compensation/Personal Injury [Member]        
Service fee revenue, net of contractual allowances and discounts 8,660 8,867 17,407 17,925
Other [Member]        
Service fee revenue, net of contractual allowances and discounts $ 7,988 [1] $ 8,362 $ 15,150 $ 16,648 [1]
[1] Other consists of revenue from teleradiology services, consulting fees and software revenue.