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RECEIVABLES
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
RECEIVABLES
RECEIVABLES
A summary of accounts receivable as of December 31, 2016 and December 31, 2015 is as follows (in thousands):
 
 
December 31,
 
December 31,
 
2016
 
2015
Trade accounts receivable
$
230,889

 
$
170,774

Unbilled revenues
39,719

 
47,098

Allowance for doubtful accounts
(7,835
)
 
(3,548
)
Total
$
262,773

 
$
214,324


The allowance for doubtful accounts is our best estimate of the amount of probable credit losses in our existing accounts receivable. Account balances are charged off against the allowance after all means of collection have been exhausted and the potential for recovery is remote. The following summarizes the activity in the allowance for doubtful accounts as of December 31, 2016, December 31, 2015, and May 31, 2015 and 2014 (in thousands):

 
Twelve Months Ended
December 31,
 
Seven Months Ended
December 31,
 
Twelve Months Ended
May 31,
 
2016
 
2015
 
2015
 
2014
Balance at beginning of period
$
3,548

 
$
2,775

 
$
4,784

 
$
5,438

Provision for doubtful accounts
6,336

 
1,819

 
233

 
2,140

Write-off of bad debts
(2,049
)
 
(1,046
)
 
(2,242
)
 
(2,794
)
Balance at end of period
$
7,835

 
$
3,548

 
$
2,775

 
$
4,784