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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Aging of net accounts receivable
The following table sets forth the aging of our net accounts receivable (net of allowance for contractual adjustments and prior to allowance for doubtful accounts), aged based on date of service and categorized based on the three primary overall types of accounts receivable characteristics (in thousands):
 
 
December 31, 2015
 
December 31, 2014
 
 
0 - 180 days
 
Over 180 days
 
Total
 
0 - 180 days
 
Over 180 days
 
Total
Government
 
$
19,944

 
$
11,369

 
$
31,313

 
$
25,812

 
$
13,036

 
$
38,848

Commercial
 
103,357

 
22,345

 
125,702

 
108,439

 
35,313

 
143,752

Patient
 
5,014

 
6,025

 
11,039

 
4,899

 
10,562

 
15,461

Gross accounts receivable
 
$
128,315

 
$
39,739

 
168,054

 
$
139,150

 
$
58,911

 
198,061

Allowance for doubtful accounts
 
 
 
 
 
(59,689
)
 
 
 
 
 
(66,405
)
Net accounts receivable
 
 
 
 
 
$
108,365

 
 
 
 
 
$
131,656



Estimated useful lives of assets
Property and equipment is stated at cost less accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of assets as follows:
Asset
 
Useful Life
Computer hardware and software
 
3
years
 -
5
years
Office equipment
 

 
 
5
years
Vehicles
 
4
years
 -
5
years
Medical equipment
 
13
months
 -
5
years
Furniture and fixtures
 

 
 
5
years