Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Apr. 02, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 120,724	$ 104,377
Restricted Cash, Current	0	25,121
Accounts receivable, net	102,328	153,806
Contract assets	114,601	108,645
Contract costs, current portion	5,050	3,511
Inventories	197,303	185,072
Income tax refunds receivable	4,851	5,269
Other current assets	12,628	12,173
Total current assets	557,485	597,974
Property, plant and equipment, net of accumulated depreciation of $233,534 and $228,984, respectively	207,145	210,852
Operating Lease, Right-of-Use Asset	12,048	12,880
Goodwill	243,688	247,244
Other intangible assets, net	146,626	150,198
Deferred income taxes	37,540	39,809
Contract costs, noncurrent portion	7,205	8,311
Other assets	39,000	39,125
Total assets	1,250,737	1,306,393
Current liabilities:
Accounts payable – trade	45,887	60,200
Accrued salaries and wages	40,306	70,552
Contract liabilities, current portion	32,622	39,073
Operating Lease, Liability, Current	4,057	4,305
Income taxes payable	1,203	19
Other current liabilities	35,722	36,177
Total current liabilities	159,797	228,412
Long-term debt, excluding current portion, net of debt issuance costs	186,378	185,401
Deferred income taxes	7,205	7,381
Underfunded pension	63,185	69,610
Contract liabilities, noncurrent portion	12,120	11,019
Operating Lease, Liability, Noncurrent	8,632	9,325
Other Liabilities, Noncurrent	46,201	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; 30,370,157 and 30,278,668 shares issued, respectively	30,370	30,279
Additional paid-in capital	241,444	238,829
Retained earnings	730,913	728,764
Accumulated other comprehensive income (loss)	(114,466)	(130,821)
Less 2,564,358 and 2,555,785 shares of common stock, respectively, held in treasury, at cost	(121,042)	(120,613)
Total shareholders’ equity	767,219	746,438
Total liabilities and shareholders’ equity	$ 1,250,737	$ 1,306,393