Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 41,844	$ 31,464
Accounts receivable	124,014	100,817
Inventories	220,352	200,865
Prepaid and other current assets	24,733	12,138
Total current assets	410,943	345,284
Long-term deferred income taxes	17,047	39,409
Property, plant, and equipment	891,789	861,267
Less allowances for depreciation, depletion, and amortization	(636,211)	(608,636)
Property, plant, and equipment — net	255,578	252,631
Intangible assets	9,847	11,074
Other assets	6,992	5,950
Goodwill	90,677	86,950
Total Assets	791,084	741,298
Current liabilities
Short-term debt	777	733
Accounts payable	49,059	32,533
Salaries and wages	42,694	29,885
Taxes other than income taxes	2,492	1,395
Other liabilities and accrued items	25,552	19,945
Income taxes	1,084	4,781
Unearned revenue	5,451	1,105
Total current liabilities	127,109	90,377
Other long-term liabilities	30,967	17,979
Retirement and post-employment benefits	93,225	91,505
Unearned income	36,905	41,369
Long-term income taxes	4,857	2,100
Deferred income taxes	213	274
Long-term debt	2,827	3,605
Shareholders’ equity
Serial preferred stock (no par value; 5,000 authorized shares, none issued)	0	0
Common stock (no par value; 60,000 authorized shares, issued shares of 27,148 for both 2017 and 2016)	223,484	212,702
Retained earnings	536,116	517,903
Common stock in treasury (7,042 shares for 2017 and 7,200 shares for 2016)	(166,128)	(154,399)
Accumulated other comprehensive loss	(102,937)	(86,181)
Other equity transactions	4,446	4,064
Total shareholders’ equity	494,981	494,089
Total Liabilities and Shareholders’ Equity	$ 791,084	$ 741,298