Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2017

Receivables [Abstract]

Summary of Accounts Receivable

(Table only in thousands)	2017			2016
Trade receivables	$	11,603		$	11,976
Contract receivables		60,543			72,835
Allowance for doubtful accounts		(4,156	)		(1,749	)
Total accounts receivable	$	67,990		$	83,062