Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Schedule of Accounts Receivable

Accounts receivable consists of the following (in thousands):

	March 31, 2018			December 31, 2017
Trade accounts receivable	$	129,549		$	140,209
Costs in excess of billings	22,214			11,610
Total accounts receivables	151,763			151,819
Less allowance for doubtful accounts	(6,581		)	(6,434		)
Accounts receivable	$	145,182		$	145,385