Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2018

Receivables [Abstract]

Schedule Of Accounts Receivable

Accounts receivable consisted of the following at December 31:

(in thousands)	2018			2017
Contract receivables	$	282,283		$	231,808
Other		7,475			9,073
		289,758			240,881
Less: Allowance for doubtful accounts		(1,331	)		(605	)
	$	288,427		$	240,276

Schedule Of Allowance For Doubtful Accounts Activity

The roll-forward of activity in the allowance for doubtful accounts was as follows for the years ended December 31:

(in thousands)	2018			2017			2016
Balance at beginning of period	$	605		$	432		$	376
Less: Reduction in (provision for) allowances		(860	)		(263	)		(146	)
Less: Write offs, net of recoveries		123			92			90
Change in foreign currency translation		11			(2	)		—
Balance at end of period	$	1,331		$	605		$	432