Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Oct. 01, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 121,458	$ 104,377
Restricted Cash, Current	0	25,121
Accounts receivable, net	80,849	153,806
Contract assets	128,824	108,645
Contract costs, current portion	1,533	3,511
Inventories	195,700	185,072
Income tax refunds receivable	2,123	5,269
Other current assets	14,488	12,173
Total current assets	544,975	597,974
Property, plant and equipment, net of accumulated depreciation of $246,431 and $228,984, respectively	199,955	210,852
Operating Lease, Right-of-Use Asset	11,091	12,880
Goodwill	242,366	247,244
Other intangible assets, net	141,055	150,198
Deferred income taxes	34,061	39,809
Contract costs, noncurrent portion	10,389	8,311
Other assets	37,808	39,125
Total assets	1,221,700	1,306,393
Current liabilities:
Accounts payable – trade	38,738	60,200
Accrued salaries and wages	40,639	70,552
Contract liabilities, current portion	10,719	39,073
Operating Lease, Liability, Current	4,215	4,305
Income taxes payable	1,228	19
Disposal Group, Including Discontinued Operation, Liabilities, Current	0	18,086
Other current liabilities	42,291	36,177
Total current liabilities	137,830	228,412
Long-term debt, excluding current portion, net of debt issuance costs	188,407	185,401
Deferred income taxes	7,180	7,381
Underfunded pension	37,326	69,610
Contract liabilities, noncurrent portion	15,426	11,019
Operating Lease, Liability, Noncurrent	7,556	9,325
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent	0	1,171
Other Liabilities, Noncurrent	41,226	47,636
Commitments and contingencies (Note 14)
Shareholders' equity:
Preferred stock, $1 par value, 200,000 shares authorized; none outstanding	0	0
Common stock, $1 par value, 50,000,000 shares authorized; voting; 30,414,184 and 30,278,668 shares issued, respectively	30,414	30,279
Additional paid-in capital	246,516	238,829
Retained earnings	746,300	728,764
Accumulated other comprehensive income (loss)	(115,322)	(130,821)
Less 2,569,169 and 2,555,785 shares of common stock, respectively, held in treasury, at cost	(121,159)	(120,613)
Total shareholders’ equity	786,749	746,438
Total liabilities and shareholders’ equity	$ 1,221,700	$ 1,306,393