Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jul. 02, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 98,362	$ 104,377
Restricted Cash, Current	0	25,121
Accounts receivable, net	99,361	153,806
Contract assets	114,552	108,645
Contract costs, current portion	3,841	3,511
Inventories	196,133	185,072
Income tax refunds receivable	3,783	5,269
Other current assets	13,194	12,173
Total current assets	529,226	597,974
Property, plant and equipment, net of accumulated depreciation of $240,970 and $228,984, respectively	204,659	210,852
Operating Lease, Right-of-Use Asset	12,075	12,880
Goodwill	244,480	247,244
Other intangible assets, net	144,204	150,198
Deferred income taxes	36,144	39,809
Contract costs, noncurrent portion	8,332	8,311
Other assets	37,545	39,125
Total assets	1,216,665	1,306,393
Current liabilities:
Accounts payable – trade	36,543	60,200
Accrued salaries and wages	37,782	70,552
Contract liabilities, current portion	17,268	39,073
Operating Lease, Liability, Current	4,005	4,305
Income taxes payable	1,555	19
Disposal Group, Including Discontinued Operation, Liabilities, Current	0	18,086
Other current liabilities	35,183	36,177
Total current liabilities	132,336	228,412
Long-term debt, excluding current portion, net of debt issuance costs	187,358	185,401
Deferred income taxes	7,293	7,381
Underfunded pension	44,754	69,610
Contract liabilities, noncurrent portion	14,324	11,019
Operating Lease, Liability, Noncurrent	8,681	9,325
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent	0	1,171
Other Liabilities, Noncurrent	42,707	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; 30,400,125 and 30,278,668 shares issued, respectively	30,400	30,279
Additional paid-in capital	244,546	238,829
Retained earnings	737,203	728,764
Accumulated other comprehensive income (loss)	(111,848)	(130,821)
Less 2,567,430 and 2,555,785 shares of common stock, respectively, held in treasury, at cost	(121,089)	(120,613)
Total shareholders’ equity	779,212	746,438
Total liabilities and shareholders’ equity	$ 1,216,665	$ 1,306,393