Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 104,377	$ 471,540
Restricted Cash, Current	25,121	0
Accounts receivable, net	153,806	156,492
Contract with Customer, Asset, Net, Current	108,645	121,614
Capitalized Contract Cost, Net, Current	3,511	6,052
Inventories	185,072	156,353
Income tax refunds receivable	5,269	8,069
Other current assets	12,173	16,368
Total current assets	597,974	936,488
Accumulated depreciation	228,984	210,549
Property, plant and equipment, net of accumulated depreciation of $228,984 and $210,549, respectively	210,852	140,450
Operating Lease, Right-of-Use Asset	12,880	15,159
Goodwill	247,244	195,314
Other intangible assets, net	150,198	53,439
Deferred Tax Assets, Net	39,809	35,240
Capitalized Contract Cost, Net, Noncurrent	8,311	6,099
Other assets	39,125	36,754
Total assets	1,306,393	1,418,943
Current liabilities:
Accounts payable – trade	60,200	70,884
Accrued salaries and wages	70,552	43,220
Contract with Customer, Liability, Current	39,073	42,942
Operating Lease, Liability, Current	4,305	4,306
Income taxes payable	19	4,722
Disposal Group, Including Discontinued Operation, Liabilities, Current	18,086	0
Other current liabilities	36,177	37,918
Total current liabilities	228,412	203,992
Long-term debt, excluding current portion, net of debt issuance costs	185,401	181,622
Deferred Income Tax Liabilities, Net	7,381	6,994
Underfunded pension	69,610	97,246
Contract with Customer, Liability, Noncurrent	11,019	37,855
Operating Lease, Liability, Noncurrent	9,325	11,617
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent	1,171	0
Other long-term liabilities	47,636	56,415
Commitments and contingencies (Note 19)
Preferred stock, shares outstanding (in shares)	0	0
Preferred stock, shares authorized (in shares)	200,000	200,000
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares issued (in shares)	30,278,668	30,058,455
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, par value (in dollars per share)	$ 1	$ 1
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; 30,278,668 and 30,058,455 shares issued, respectively	30,279	30,058
Additional paid-in capital	238,829	228,153
Retained earnings	728,764	820,666
Accumulated other comprehensive income (loss)	$ (130,821)	$ (150,893)
Shares of common stock held in treasury at cost (in shares)	2,555,785	2,219,332
Less 2,555,785 and 2,219,332 shares of common stock, respectively, held in treasury, at cost	$ (120,613)	$ (104,782)
Total shareholders’ equity	746,438	823,202
Total liabilities and shareholders’ equity	$ 1,306,393	$ 1,418,943