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ALLOWANCE FOR DOUBTFUL ACCOUNTS AND CUSTOMER DISPUTES (Tables)
 12 Months Ended
Dec. 31, 2015
Receivables [Abstract]  
Schedule of Activity in Allowance for Doubtful Accounts
Activity in our allowance for doubtful accounts receivable and customer disputes consisted of the following (in thousands): 
 
 
December 31,
 
 
2015
 
2014
Balance, beginning of period
 
$
3,726

 
$
2,813

Provision for doubtful accounts and customer disputes
 
4,198

 
1,924

Uncollectible receivables written off, net of recoveries
 
(1,799
)
 
(1,011
)
Balance, end of period
 
$
6,125

 
$
3,726