Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 241,316	$ 195,540
Accounts receivable, net	188,423	218,271
Contract assets, net	139,289	79,070
Inventories	110,478	95,149
Income taxes prepaid and receivable	5,940	6,162
Prepaid expenses and other current assets	31,830	24,142
Total current assets	717,276	618,334
Property, plant and equipment, net	448,554	466,462
Intangibles, net	46,869	52,892
Goodwill	187,553	180,934
Deferred income taxes	38,757	51,621
Noncurrent receivables, net	36,265	41,234
Other assets	74,662	62,891
Total assets	1,549,936	1,474,368
Current liabilities:
Accounts payable	49,173	65,203
Accrued liabilities	125,459	125,885
Current maturities of long-term debt	9	20
Income taxes payable	16,222	11,611
Total current liabilities	190,863	202,719
Long-term debt	398,000	424,009
Other noncurrent liabilities	130,424	132,725
Deferred taxes and other liabilities	10,784	12,226
Total liabilities	730,071	771,679
Commitments and Contingencies
Shareholders’ Equity
Preferred stock, par value $5.00 per share; authorized 2,000,000 shares; none issued	0	0
Additional paid-in capital	433,696	432,518
Retained earnings	770,746	698,496
Accumulated items of other comprehensive income:
Translation adjustments	(83,203)	(122,852)
Pension and postretirement liability adjustments	(39,661)	(49,994)
Derivative valuation adjustment	(9,544)	(3,135)
Treasury stock (Class A), at cost; 8,391,011 shares in 2020 and 8,408,770 shares in 2019	(256,009)	(256,391)
Total Company shareholders’ equity	816,066	698,683
Noncontrolling interest	3,799	4,006
Total equity	819,865	702,689
Total liabilities and shareholders’ equity	1,549,936	1,474,368
Common Class A
Shareholders’ Equity
Common stock, par value	39	39
Common Class B
Shareholders’ Equity
Common stock, par value	$ 2	$ 2