CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 50,613	$ 59,875
Accounts receivable, less allowances (2018 - $1,462; 2017 - $1,507)	126,330	116,712
Contract assets	26,598	0
Inventories	78,901	80,339
Taxes receivable	4,815	5,525
Prepaid expenses	5,603	4,858
Other current assets	6,986	6,186
Total current assets	299,846	273,495
Property, plant and equipment, at cost	403,548	397,152
Accumulated depreciation	(235,240)	(226,820)
Net, property, plant and equipment	168,308	170,332
Goodwill	67,022	68,969
Other intangible assets, net	36,329	40,543
Other assets, net	7,269	7,532
Total assets	578,774	560,871
Current liabilities:
Current portion of long-term debt	271	277
Accounts payable	74,186	71,931
Accrued payroll and other compensation	13,286	15,978
Accrued taxes	3,312	2,230
Other accrued liabilities	15,255	11,690
Total current liabilities	106,310	102,106
Long-term debt	76,784	76,913
Deferred tax liabilities	16,257	14,714
Benefit plan liabilities	5,261	9,743
Other long-term liabilities	3,447	3,999
Commitments and Contingencies (Note 14)
Stockholders’ equity:
Preferred stock	0	0
Common stock	251	250
Capital in excess of par value	91,177	88,006
Retained earnings	397,885	374,783
Accumulated other comprehensive loss	(28,280)	(20,148)
Treasury stock, at cost	(90,318)	(89,495)
Total stockholders’ equity	370,715	353,396
Total liabilities and stockholders’ equity	$ 578,774	$ 560,871