Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 26, 2015
Current assets:
Cash and cash equivalents	$ 96,045	$ 115,370
Short-term investments	31,990	1,652
Accounts receivable, net	63,019	59,832
Inventories:
Raw materials and purchased parts	23,037	24,423
Work in process	17,599	20,124
Finished goods	4,866	6,801
	45,502	51,348
Other current assets	8,593	6,261
Total current assets	245,149	234,463
Property plant and equipment, net	18,234	19,000
Goodwill	58,849	60,264
Intangible assets, net	17,835	25,297
Other assets	5,445	6,322
	345,512	345,346
Current liabilities:
Accounts payable	31,444	27,290
Accrued compensation and benefits	14,770	15,628
Accrued warranty	3,737	3,785
Deferred profit	6,886	3,730
Income taxes payable	1,920	4,195
Other accrued liabilities	9,932	8,563
Total current liabilities	68,689	63,191
Accrued retirement benefits	15,673	15,397
Noncurrent deferred gain on sale of facility	11,689	13,142
Deferred income taxes	5,852	6,954
Noncurrent income tax liabilities	6,375	6,761
Other accrued liabilities	1,765	1,764
Commitments and contingencies
Stockholders' equity:
Preferred stock, $1 par value; 1,000 shares authorized, none issued
Common stock, $1 par value; 60,000 shares authorized, 26,842 shares issued and outstanding in 2016 and 26,240 shares in 2015	26,842	26,240
Paid-in capital	111,950	105,516
Retained earnings	124,559	128,153
Accumulated other comprehensive loss	(27,882)	(21,772)
Total stockholders' equity	235,469	238,137
	$ 345,512	$ 345,346