Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 134,286	$ 96,045
Short-term investments	21,329	31,990
Accounts receivable, net	71,125	63,019
Inventories:
Raw materials and purchased parts	27,918	23,037
Work in process	25,130	17,599
Finished goods	9,037	4,866
	62,085	45,502
Other current assets	8,613	8,593
Total current assets	297,438	245,149
Property plant and equipment, net	34,172	18,234
Goodwill	65,613	58,849
Intangible assets, net	16,748	17,835
Other assets	6,486	5,445
	420,457	345,512
Current liabilities:
Short-term borrowings	3,108
Current installments of long-term debt	1,280
Accounts payable	37,556	31,444
Accrued compensation and benefits	20,178	14,770
Accrued warranty	4,280	3,737
Deferred profit	6,608	6,886
Income taxes payable	2,159	1,920
Other accrued liabilities	10,098	9,932
Total current liabilities	85,267	68,689
Accrued retirement benefits	18,544	15,673
Noncurrent deferred gain on sale of facility	10,233	11,689
Deferred income taxes	2,921	5,852
Noncurrent income tax liabilities	6,270	6,375
Long-term debt	4,575
Other accrued liabilities	3,556	1,765
Stockholders' equity:
Preferred stock, $1 par value; 1,000 shares authorized, none issued
Common stock, $1 par value; 60,000 shares authorized, 28,489 shares issued and outstanding in 2017 and 26,842 shares in 2016	28,489	26,842
Paid-in capital	127,663	111,950
Retained earnings	150,726	124,559
Accumulated other comprehensive loss	(17,787)	(27,882)
Total stockholders' equity	289,091	235,469
	$ 420,457	$ 345,512