Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 195,540	$ 197,755
Accounts receivable, net	218,271	223,176
Contract assets	79,070	57,447
Inventories	95,149	85,904
Income taxes prepaid and receivable	6,162	7,473
Prepaid expenses and other current assets	24,142	21,294
Total current assets	618,334	593,049
Property, plant and equipment, net	466,462	462,055
Intangibles, net	52,892	49,206
Goodwill	180,934	164,382
Deferred income taxes	51,621	62,622
Noncurrent receivables	41,234	45,061
Other assets	62,891	41,617
Total assets	1,474,368	1,417,992
Current liabilities:
Accounts payable	65,203	52,246
Accrued liabilities	125,885	129,030
Current maturities of long-term debt	20	1,224
Income taxes payable	11,611	6,806
Total current liabilities	202,719	189,306
Long-term debt	424,009	523,707
Other noncurrent liabilities	132,725	88,277
Deferred taxes and other liabilities	12,226	8,422
Total liabilities	771,679	809,712
Commitments and Contingencies
Shareholders' Equity
Preferred stock, par value $5.00 per share; authorized 2,000,000 shares; none issued
Additional paid-in capital	432,518	430,555
Retained earnings	698,496	589,645
Accumulated items of other comprehensive income:
Translation adjustments	(122,852)	(115,976)
Pension and postretirement liability adjustments	(49,994)	(47,109)
Derivative valuation adjustment	(3,135)	4,697
Treasury stock (Class A), at cost 8,408,770 shares in 2019 and 8,418,620 shares in 2018	(256,391)	(256,603)
Total Company shareholders' equity	698,683	605,249
Noncontrolling interest	4,006	3,031
Total equity	702,689	608,280
Total liabilities and shareholders' equity	1,474,368	1,417,992
Common Class A [Member]
Shareholders' Equity
Common Stock	39	37
Common Class B [Member]
Shareholders' Equity
Common Stock	$ 2	$ 3