Accounts Receivable (Tables)

9 Months Ended

Sep. 30, 2016

Receivables [Abstract]

Schedule of Accounts Receivable

Accounts receivable consists of the following (in thousands):

	September 30, 2016			December 31, 2015
Trade accounts receivable	$	99,877		$	102,277
Contract receivables:
Amounts billed	46,414			53,830
Costs in excess of billings	13,544			13,730
Total contract receivables	59,958			67,560
Total accounts receivable	159,835			169,837
Less allowance for doubtful accounts	(4,401		)	(4,868		)
Accounts receivable	$	155,434		$	164,969