Concentration of Risk and Enterprise Wide Disclosures

12 Months Ended

Dec. 31, 2017

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, 2017 and December 31, 2016, respectively:



	December 31, 2017				December 31, 2016
Federal Government	$	3,509	3	%	$	5,542	4	%
State Governments	4,503		3	%	9,302		7	%
Local Governments	18,256		15	%	20,886		16	%
Private Companies	97,874		79	%	96,673		73	%
Total receivables	$	124,142	100	%	$	132,403	100	%

At December 31, 2017 and 2016, 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, 2017, 2016 and 2015.



	2017		%		2016		%		2015		%
Federal Government	$	63,823	11	%	$	40,361	7	%	$	45,439	10	%
State Governments	42,613		7	%	37,700		7	%	42,026		9	%
Local Governments	91,592		16	%	94,461		16	%	130,187		28	%
Private Companies	380,525		66	%	405,714		70	%	248,846		53	%
Total contract revenues	$	578,553	100	%	$	578,236	100	%	$	466,498	100	%

In the years ended December 31, 2017, 2016 and 2015, 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 1.6%, 1.3% and 4.1% of total revenues for the years ended December 31, 2017, 2016 and 2015, respectively, and were primarily located in the Caribbean Basin and Mexico.