5.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 December 31, 2019 and December 31, 2018, respectively:


	December 31, 2019				December 31, 2018
Federal Government	$	4,765	3	%	$	2,319	2	%
State Governments		5,864	4	%		916	1	%
Local Governments		41,944	26	%		30,187	28	%
Private Companies		106,514	67	%		74,953	69	%
Total receivables	$	159,087	100	%	$	108,375	100	%

At December 31, 2019 and 2018, 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, 2019, 2018 and 2017.



	2019		%		2018		%		2017		%
Federal Government	$	46,425	6	%	$	42,143	8	%	$	63,823	11	%
State Governments		47,831	7	%		30,470	6	%		42,613	7	%
Local Government		212,958	30	%		107,478	21	%		91,591	16	%
Private Companies		401,176	57	%		340,803	65	%		380,526	66	%
Total contract revenues	$	708,390	100	%	$	520,894	100	%	$	578,553	100	%

In the years ended December 31, 2019, 2018 and 2017, no single customer exceeded 10.0% 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.

Contract revenues generated outside the United States totaled 1.6%, 2.3% and 1.6% of total revenues for the years ended December 31, 2019, 2018 and 2017, respectively, and were primarily located in the Caribbean Basin and Mexico.