CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 48,919	$ 49,237
Accounts receivable, less allowances (2019 - $1,850; 2018 - $1,440)	133,821	144,938
Contract assets	26,804	23,040
Inventories	88,189	84,465
Taxes receivable	2,354	2,912
Prepaid expenses	4,987	4,707
Other current assets	7,743	7,779
Total current assets	312,817	317,078
Property, plant and equipment, at cost	475,395	458,075
Accumulated depreciation	(258,733)	(244,706)
Net, property, plant and equipment	216,662	213,369
Operating lease right-of-use assets	24,148	0
Goodwill	195,613	196,963
Other intangible assets, net	120,644	136,604
Other assets, net	9,003	8,672
Total assets	878,887	872,686
Current liabilities:
Current portion of long-term debt	9,981	10,172
Accounts payable	84,506	73,265
Accrued payroll and other compensation	17,605	16,621
Deferred revenue	2,630	6,990
Other accrued liabilities	26,072	14,298
Total current liabilities	140,794	121,346
Long-term debt	276,689	314,641
Long-term operating lease liabilities	19,241	0
Deferred tax liabilities	36,125	39,265
Benefit plan liabilities	19,827	22,795
Other long-term liabilities	4,540	5,364
Commitments and Contingencies (Note 16)
Stockholders’ equity:
Preferred stock	0	0
Common stock	252	253
Capital in excess of par value	92,720	90,851
Retained earnings	411,090	411,325
Accumulated other comprehensive loss	(31,860)	(42,685)
Treasury stock, at cost	(90,531)	(90,469)
Total stockholders’ equity	381,671	369,275
Total liabilities and stockholders’ equity	$ 878,887	$ 872,686