Accounts Receivable (Tables)

9 Months Ended

Sep. 30, 2017

Accounts Receivable.

Summary of accounts receivable

	September 30,		December 31,
	2017		2016
Contracts receivable, net of allowance for doubtful accounts of $480 at September 30, 2017 and $1,030 at December 31, 2016, respectively	$	292,281	$	340,871
Retention receivable		59,388		46,394
		351,669		387,265
Other accounts receivable		5,182		735
	$	356,851	$	388,000