Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Schedule of Accounts Receivable

Accounts receivable consists of the following (in thousands):

	March 31, 2019			December 31, 2018
Trade accounts receivable	$	149,159		$	124,609
Costs in excess of billings	25,519			22,634
Total accounts receivables	174,678			147,243
Less allowance for doubtful accounts	(7,477		)	(6,960		)
Accounts receivable	$	167,201		$	140,283