Revenues

6 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

Revenue Recognition

We serve approximately 500 customers annually in more than 40 countries and across a wide variety of industries. For the three months ended June 30, 2019 and 2018, the Company's ten largest customers accounted for approximately 47% and 45% of total sales, respectively. For the six months ended June 30, 2019 and 2018, the Company's ten largest customers accounted for approximately 46% and 45% of total sales, respectively.

We typically sell to customers under master service agreements, with one- to two-year terms on average, or by purchase orders. We have historically experienced low customer turnover and have an average customer relationship of approximately 20 years. Our largest customer is Shaw Industries Group Inc. (“Shaw”), one of the world's largest consumers of caprolactam and Nylon 6 resin. We sell Nylon 6 resin and caprolactam to Shaw under a long-term agreement. For the three months ended June 30, 2019

and 2018, our sales to Shaw were 19% and 22%, respectively, of our total sales. For the six months ended June 30, 2019 and 2018, our sales to Shaw were 21% and 22%, respectively, of our total sales.

Each of the Company’s product lines represented the following approximate percentage of total sales for the three and six months ended June 30, 2019 and 2018:


	Three Months Ended June 30,			Six Months Ended June 30,
	2019	2018	2019	2018
Nylon	27%	27%	29%	28%
Caprolactam	20%	19%	20%	18%
Ammonium Sulfate Fertilizers	27%	21%	25%	20%
Chemical Intermediates	26%	33%	26%	34%
	100%	100%	100%	100%

The Company's revenues by geographic area for the three and six months ended June 30, 2019 and 2018 were as follows:


	Three Months Ended June 30,						Six Months Ended June 30,
	2019		2018		2019		2018
United States	$	289,551	$	342,497	$	547,193	$	640,145
International	55,664		57,962		112,917		119,552
Total	$	345,215	$	400,459	$	660,110	$	759,697

Deferred Income and Customer Advances

The Company defers revenues when cash payments are received in advance of our performance. Customer advances relate primarily to sales from the ammonium sulfate business. Below is a roll-forward of Deferred income and customer advances for the six months ended June 30, 2019:



Opening balance January 1, 2019	$	22,556

Additional cash advances	1,083

Less amounts recognized in revenues	(20,455)

Ending balance June 30, 2019	$	3,184

The Company expects to recognize as revenue the June 30, 2019 ending balance of Deferred income and customer advances within one year or less.