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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Schedule of Allowance for Doubtful Accounts Receivable
The following table presents the changes in the allowance for doubtful accounts (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Allowance for doubtful accounts:
 
 
 
 
 
Balance, beginning of period
$
4,992

 
$
3,208

 
$
1,627

Add: bad debt expense
16,883

 
15,913

 
10,271

Less: write-offs, net of recoveries
(14,523
)
 
(14,129
)
 
(8,690
)
Balance, end of period
$
7,352

 
$
4,992

 
$
3,208