Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jul. 03, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 235,608	$ 471,540
Restricted Cash, Current	25,130	0
Accounts receivable, net	176,565	156,492
Contract assets	131,061	121,614
Contract costs, current portion	7,132	6,052
Inventories	207,340	156,353
Income tax refunds receivable	11,418	8,069
Other current assets	14,687	16,368
Total current assets	808,941	936,488
Property, plant and equipment, net of accumulated depreciation of $223,553 and $210,549, respectively	218,202	140,450
Operating Lease, Right-of-Use Asset	13,732	15,159
Goodwill	304,768	195,314
Other intangible assets, net	141,630	53,439
Deferred income taxes	30,176	35,240
Contract costs, noncurrent portion	5,861	6,099
Other assets	36,774	36,754
Total assets	1,560,084	1,418,943
Current liabilities:
Accounts payable – trade	58,267	70,884
Accrued salaries and wages	49,727	43,220
Contract liabilities, current portion	43,739	42,942
Operating Lease, Liability, Current	4,535	4,306
Income taxes payable	2,302	4,722
Other current liabilities	39,573	37,918
Total current liabilities	198,143	203,992
Long-term debt, excluding current portion, net of debt issuance costs	384,609	181,622
Deferred income taxes	6,723	6,994
Underfunded pension	78,782	97,246
Contract liabilities, noncurrent portion	26,056	37,855
Operating Lease, Liability, Noncurrent	9,940	11,617
Other Liabilities, Noncurrent	52,435	56,415
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; 30,214,005 and 30,058,455 shares issued, respectively	30,214	30,058
Additional paid-in capital	235,195	228,153
Retained earnings	809,769	820,666
Accumulated other comprehensive income (loss)	(151,210)	(150,893)
Less 2,554,617 and 2,219,332 shares of common stock, respectively, held in treasury, at cost	(120,572)	(104,782)
Total shareholders’ equity	803,396	823,202
Total liabilities and shareholders’ equity	1,560,084	1,418,943
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 223,553	$ 210,549
Preferred stock, par value (in usd per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	200,000	200,000
Preferred Stock, Shares Outstanding	0	0
Common stock, par value (in usd per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	30,214,005	30,058,455
Common stock held in treasury, at cost (in shares)	2,554,617	2,219,332