Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2020

Receivables [Abstract]

Schedule of Accounts Receivable

Accounts receivable consisted of the following at December 31:

(in thousands)	2020		2019
Contract receivables	$	382,096	$	385,744
Other	5,538		6,099
	387,634		391,843
Less: allowance for doubtful accounts	(1,696)		(3,364)
	$	385,938	$	388,479

Schedule of Allowance for Doubtful Accounts

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

(in thousands)	2020		2019		2018
Balance at beginning of period	$	3,364	$	1,331	$	605
Less: reduction in (provision for) allowances	1,296		(2,532)		(860)
Less: write offs, net of recoveries	375		501		123
Change in foreign currency translation	(3)		(2)		11
Balance at end of period	$	1,696	$	3,364	$	1,331