CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 49,103	$ 59,875
Accounts receivable, less allowances (2018 - $1,463; 2017 - $1,507)	136,078	116,712
Contract assets	25,005	0
Inventories	74,263	80,339
Taxes receivable	5,263	5,525
Prepaid expenses	4,016	4,858
Other current assets	6,765	6,186
Total current assets	300,493	273,495
Property, plant and equipment, at cost	405,428	397,152
Accumulated depreciation	(234,699)	(226,820)
Net, property, plant and equipment	170,729	170,332
Goodwill	68,958	68,969
Other intangible assets, net	39,031	40,543
Other assets, net	7,131	7,532
Total assets	586,342	560,871
Current liabilities:
Current portion of long-term debt	283	277
Accounts payable	80,405	71,931
Accrued payroll and other compensation	13,678	15,978
Accrued taxes	3,162	2,230
Other accrued liabilities	14,470	11,690
Total current liabilities	111,998	102,106
Long-term debt	76,862	76,913
Deferred tax liabilities	15,542	14,714
Benefit plan liabilities	8,489	9,743
Other long-term liabilities	3,618	3,999
Commitments and Contingencies (Note 14)
Stockholders’ equity:
Preferred stock	0	0
Common stock	251	250
Capital in excess of par value	89,768	88,006
Retained earnings	387,435	374,783
Accumulated other comprehensive loss	(17,303)	(20,148)
Treasury stock, at cost	(90,318)	(89,495)
Total stockholders’ equity	369,833	353,396
Total liabilities and stockholders’ equity	$ 586,342	$ 560,871