Accounts Receivable (Tables)

9 Months Ended

Sep. 30, 2018

Receivables [Abstract]

Schedule of Accounts Receivable

Accounts receivable consists of the following (in thousands):

	September 30, 2018			December 31, 2017
Trade accounts receivable	$	166,208		$	140,209
Costs in excess of billings	21,522			11,610
Total accounts receivables	187,730			151,819
Less allowance for doubtful accounts	(6,855		)	(6,434		)
Accounts receivable	$	180,875		$	145,385