Concentration of Risk and Enterprise Wide Disclosures

Accounts receivable include amounts billed to governmental agencies and private customers and do not bear interest. Balances billed to customers but not paid pursuant to retainage provisions generally become payable upon contract completion and acceptance by the owner.

The table below presents the concentrations of current receivables (trade and retainage) at December 31, 2018 and December 31, 2017, respectively:



	December 31, 2018				December 31, 2017
Federal Government	$	2,319	2	%	$	3,509	3	%
State Governments	916		1	%	4,503		3	%
Local Governments	30,187		28	%	18,256		15	%
Private Companies	74,953		69	%	97,874		79	%
Total receivables	$	108,375	100	%	$	124,142	100	%

At December 31, 2018 and 2017, no single customer accounted for more than 10.0% of total current receivables.

Additionally, the table below represents concentrations of contract revenue by type of customer for the years ended December 31, 2018, 2017 and 2016.



	2018		%		2017		%		2016		%
Federal Government	$	42,143	8	%	$	63,823	11	%	$	40,361	7	%
State Governments	30,470		6	%	42,613		7	%	37,700		7	%
Local Governments	107,478		21	%	91,591		16	%	94,461		16	%
Private Companies	340,803		65	%	380,526		66	%	405,714		70	%
Total contract revenues	$	520,894	100	%	$	578,553	100	%	$	578,236	100	%

In the years ended December 31, 2018, 2017 and 2016, no single customer exceeded 10.0% of total contract revenues.

The Company does not believe that the loss of any one of these customers would have a material adverse effect on the Company or its subsidiaries and affiliates since no single specific customer sustains such a large portion of receivables or contract revenue over time.

In addition, the concrete segment primarily purchases concrete from select suppliers. The loss of one of these suppliers could adversely impact short-term operations.

Contract revenues generated outside the United States totaled 2.3%, 1.6% and 1.3% of total revenues for the years ended December 31, 2018, 2017 and 2016, respectively, and were primarily located in the Caribbean Basin and Mexico.