Accounts Receivable (Tables)

6 Months Ended

Jun. 30, 2016

Receivables [Abstract]

Schedule of Accounts Receivable

Accounts receivable consists of the following (in thousands):

	June 30, 2016			December 31, 2015
Trade accounts receivable	$	105,485		$	102,277
Contract receivables:
Amounts billed	39,941			53,830
Costs in excess of billings	9,816			13,730
Total contract receivables	49,757			67,560
Total accounts receivable	155,242			169,837
Less allowance for doubtful accounts	(5,072		)	(4,868		)
Accounts receivable	$	150,170		$	164,969