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 June 30, 2019 and December 31, 2018, respectively:



	June 30, 2019				December 31, 2018
Federal Government	$	3,420	3	%	$	2,319	2	%
State Governments	3,363		2	%	916		1	%
Local Governments	50,017		37	%	30,187		28	%
Private Companies	79,381		58	%	74,953		69	%
Total receivables	$	136,181	100	%	$	108,375	100	%

At June 30, 2019 one customer in the local governments category accounted for 18% of total current receivables. At December 31, 2018, no single customer accounted for more than 10% of total current receivables.

Additionally, the table below represents concentrations of contract revenue by type of customer for the three and six months ended June 30, 2019 and 2018, respectively:



	Three months ended June 30,								Six months ended June 30,
	2019		%		2018		%		2019		%		2018		%
Federal Government	$	12,301	8	%	$	16,077	10	%	$	22,578	7	%	$	29,100	10	%
State Governments	10,286		6	%	9,898		6	%	14,341		5	%	18,274		6	%
Local Government	51,599		31	%	20,522		13	%	96,029		31	%	43,752		15	%
Private Companies	91,799		55	%	113,270		71	%	176,142		57	%	205,484		69	%
Total contract revenues	$	165,985	100	%	$	159,767	100	%	$	309,090	100	%	$	296,610	100	%

In the three months ended June 30, 2019, one customer in the local governments category accounted for 14% of total contract revenues. In the three months ended June 30, 2018, a private customer accounted for 16% of total contract revenues. In the six months ended June 30, 2019, one customer in the local governments category accounted for 11% of total contract revenues. In the six months ended June 30, 2018, a private customer accounted for 12% of total contract revenues.

The Company does not believe that the loss of any one of its 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 any one of these suppliers could adversely impact short-term operations.