Accounts Receivable

6 Months Ended

Jun. 30, 2018

Receivables [Abstract]

ACCOUNTS RECEIVABLE

NOTE E—ACCOUNTS RECEIVABLE

At June 30, 2018 and December 31, 2017, accounts receivable (in thousands) consisted of the following:

	June 30,   2018			December 31,    2017
Trade receivables	$	281,951		$	217,649
Less: Allowance for doubtful accounts	(7,773		)	(7,100		)
Net trade receivables	274,178			210,549
Other receivables	5,841			2,037
Total accounts receivable	$	280,019		$	212,586

Changes in our allowance for doubtful accounts (in thousands) during the six months ended June 30, 2018 are as follows:

	June 30,   2018
Beginning balance	$	7,780
Bad debt provision	387
Write-offs	(394		)
Ending balance	$	7,773

Our ten largest customers accounted for approximately 50% and 58% of total sales during the six months ended June 30, 2018 and 2017, respectively. Sales to one of our customers accounted for 14% of our total sales during the six months ended June 30, 2018. Sales to two of our customers accounted for 14% and 12% of our total sales during the six months ended June 30, 2017. No other customers accounted for 10% or more of our total sales. At June 30, 2018, one of our customers' accounts receivable represented 15% of our total accounts receivable, net of allowance. At December 31, 2017, two of our customers' accounts receivable represented 19% and 11% of our total accounts receivable, net of allowance. No other customers accounted for 10% or more of our total accounts receivable.