4.Concentration of Risk and Enterprise-Wide Disclosures

In both reportable segments 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 September 30, 2019 and December 31, 2018, respectively:


	September 30, 2019				December 31, 2018
Federal Government	$	595	1	%	$	2,319	2	%
State Governments		4,279	3	%		916	1	%
Local Governments		40,006	28	%		30,187	28	%
Private Companies		97,213	68	%		74,953	69	%
Total receivables	$	142,093	100	%	$	108,375	100	%

At September 30, 2019 and 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 nine months ended September 30, 2019 and 2018, respectively:


	Three months ended September 30,								Nine months ended September 30,
	2019		%		2018		%		2019		%		2018		%
Federal Government	$	13,564	7	%	$	18,072	15	%	$	36,142	7	%	$	47,170	11	%
State Governments		19,872	10	%		7,674	6	%		34,213	7	%		25,947	6	%
Local Government		54,654	27	%		25,546	20	%		150,683	30	%		69,298	17	%
Private Companies		111,417	56	%		73,781	59	%		287,559	57	%		279,267	66	%
Total contract revenues	$	199,507	100	%	$	125,073	100	%	$	508,597	100	%	$	421,682	100	%

In the three months ended September 30, 2019 and September 30, 2018, no single customer accounted for more than 10% of total contract revenues. Additionally, in the nine months ended September 30, 2019 and September 30, 2018, 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.

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