NOTE 8. RECEIVABLES

Receivables as of December 31, 2014 and 2013 consisted of the following:

$s in thousands	2014			2013
Trade	$	116,218		$	42,055
Unbilled revenue		17,857			1,296
Other		1,890			810

Total receivables		135,965			44,161
Allowance for doubtful accounts		(704	)		(525	)

Receivables, net	$	135,261		$	43,636

The allowance for doubtful accounts is a provision for uncollectible accounts receivable and unbilled receivables. The allowance is evaluated and adjusted to reflect our collection history and an analysis of the accounts receivables aging. The allowance is decreased by accounts receivable as they are written off. The allowance is adjusted periodically to reflect actual experience. The change in the allowance during 2014, 2013 and 2012 was as follows:

$s in thousands	Balance at Beginning of Period		Charged (Credited) to Costs and Expenses		Recoveries (Deductions/ Write-offs)			Adjustments			Balance at End of Period
Year ended December 31, 2014	$	525	$	1,391	$	(1,211	)	$	(1	)	$	704
Year ended December 31, 2013	$	468	$	138	$	(70	)	$	(11	)	$	525
Year ended December 31, 2012	$	311	$	137	$	17		$	3		$	468