Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2022

Receivables [Abstract]

Schedule of accounts receivable

Accounts receivable consisted of the following at December 31:

(in thousands)	2022		2021
Contract receivables	$	471,724	$	374,826
Other	2,892		2,968
	474,616		377,794
Less: allowance for doubtful accounts	(2,073)		(2,441)
	$	472,543	$	375,353

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)	2022		2021		2020
Balance at beginning of period	$	2,441	$	1,696	$	3,364
Less: reduction in (provision for) allowances	320		(764)		1,296
Less: write offs, net of recoveries	45		19		375
Change in foreign currency translation	(3)		—		3
Balance at end of period	$	2,073	$	2,441	$	1,696