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, 2018 and December 31, 2017, respectively:



	June 30, 2018				December 31, 2017
Federal Government	$	2,907	3	%	$	3,509	3	%
State Governments	2,713		2	%	4,503		3	%
Local Governments	19,910		17	%	18,256		15	%
Private Companies	89,394		78	%	97,874		79	%
Total current receivables	$	114,924	100	%	$	124,142	100	%

At June 30, 2018 and December 31, 2017, 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, 2018 and 2017, respectively:



	Three months ended June 30,								Six months ended June 30,
	2018		%		2017		%		2018		%		2017		%
Federal Government	$	16,077	10	%	$	18,360	13	%	$	29,100	10	%	$	38,092	14	%
State Governments	9,898		6	%	12,706		9	%	18,274		6	%	24,726		9	%
Local Governments	20,522		13	%	20,731		15	%	43,752		15	%	44,556		16	%
Private Companies	113,270		71	%	85,623		63	%	205,484		69	%	168,803		61	%
Total contract revenues	$	159,767	100	%	$	137,420	100	%	$	296,610	100	%	$	276,177	100	%

In the three months ended June 30, 2018, a private customer generated 16% of total contract revenues. In the three months ended June 30, 2017, no single customer accounted for more than 10% of total contract revenues. In the six months ended June 30, 2018, a private customer generated 12% of total contract revenues. In the six months ended, June 30, 2017, no single customer accounted for more than 10% 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 one of these suppliers could adversely impact short-term operations.