Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Apr. 01, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 129,097	$ 140,800
Accounts receivable, net	68,824	73,524
Contract assets	99,360	112,354
Contract costs, current portion	841	850
Inventories	209,527	193,100
Income tax refunds receivable	14,241	13,832
Other current assets	14,506	12,083
Total current assets	536,396	546,543
Property, plant and equipment, net of accumulated depreciation of $256,512 and $251,888, respectively	197,073	197,822
Operating Lease, Right-of-Use Asset	10,066	11,011
Goodwill	238,074	240,681
Other intangible assets, net	134,990	138,074
Deferred income taxes	15,601	15,717
Contract costs, noncurrent portion	10,114	10,249
Other assets	37,941	38,385
Total assets	1,180,255	1,198,482
Current liabilities:
Accounts payable – trade	41,446	42,134
Accrued salaries and wages	27,668	38,892
Contract liabilities, current portion	2,808	2,945
Operating Lease, Liability, Current	4,333	4,502
Income taxes payable	443	386
Other current liabilities	35,002	32,076
Total current liabilities	111,700	120,935
Long-term debt, excluding current portion, net of debt issuance costs	197,297	189,421
Deferred income taxes	6,137	6,506
Underfunded pension	16,310	21,786
Contract liabilities, noncurrent portion	16,528	16,528
Operating Lease, Liability, Noncurrent	6,380	7,140
Other Liabilities, Noncurrent	39,155	39,837
Commitments and contingencies (Note 15)
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; 30,550,123 and 30,434,269 shares issued, respectively	30,550	30,434
Additional paid-in capital	238,417	248,153
Retained earnings	755,519	750,445
Accumulated other comprehensive income (loss)	(115,841)	(111,385)
Less 2,591,242 and 2,573,896 shares of common stock, respectively, held in treasury, at cost	(121,897)	(121,318)
Total shareholders’ equity	786,748	796,329
Total liabilities and shareholders’ equity	$ 1,180,255	$ 1,198,482