Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2016

Receivables [Abstract]

Schedule of Accounts Receivable

Accounts receivable consists of the following (in thousands):

	March 31, 2016			December 31, 2015
Trade accounts receivable	$	102,726		$	102,277
Contract receivables:
Amounts billed	39,018			53,830
Costs in excess of billings	12,851			13,730
Total contract receivables	51,869			67,560
Total accounts receivable	154,595			169,837
Less allowance for doubtful accounts	(5,137		)	(4,868		)
Accounts receivable	$	149,458		$	164,969