CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 143,333	$ 181,742
Accounts receivable, net	174,339	171,193
Inventories	150,481	133,906
Income taxes prepaid and receivable	5,224	5,213
Prepaid expenses and other current assets	11,245	9,251
Total current assets	484,622	501,305
Property, plant and equipment, net	432,465	422,564
Intangibles, net	64,685	66,454
Goodwill	161,089	160,375
Income taxes receivable and deferred	69,505	68,865
Contract receivables	17,960	14,045
Other assets	31,799	29,825
Total assets	1,262,125	1,263,433
Current liabilities:
Notes and loans payable	274	312
Accounts payable	43,756	43,305
Accrued liabilities	85,151	95,195
Current maturities of long-term debt	51,699	51,666
Income taxes payable	7,199	9,531
Total current liabilities	188,079	200,009
Long-term debt	428,477	432,918
Other noncurrent liabilities	104,262	106,827
Deferred taxes and other liabilities	12,714	12,389
Total liabilities	733,532	752,143
SHAREHOLDERS' EQUITY
Preferred stock, par value $5.00 per share; authorized 2,000,000 shares; none issued
Additional paid in capital	427,017	425,953
Retained earnings	528,227	522,855
Accumulated items of other comprehensive income:
Translation adjustments	(123,172)	(133,298)
Pension and postretirement liability adjustments	(51,748)	(51,719)
Derivative valuation adjustment	1,458	828
Treasury stock (Class A), at cost 8,445,342 shares in 2016 and 8,455,293 shares in 2015 and 2016	(257,136)	(257,136)
Total Company shareholders' equity	524,686	507,523
Noncontrolling interest	3,907	3,767
Total equity	528,593	511,290
Total liabilities and shareholders' equity	1,262,125	1,263,433
Common Class A [Member]
SHAREHOLDERS' EQUITY
Common Stock	37	37
Common Class B [Member]
SHAREHOLDERS' EQUITY
Common Stock	$ 3	$ 3