CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 122,043	$ 51,331
Accounts receivable, net of allowance for doubtful accounts of $2,465 and $1,842, respectively	113,258	107,786
Contract assets	27,186	28,245
Inventories	71,167	80,544
Taxes receivable	6,636	3,427
Prepaid expenses	6,117	3,814
Other current assets	8,516	8,450
Total current assets	354,923	283,597
Property, plant and equipment, at cost	491,291	487,371
Accumulated depreciation	(286,713)	(265,729)
Property, plant and equipment, net	204,578	221,642
Operating lease right-of-use assets	21,522	23,116
Goodwill	85,385	133,912
Other intangible assets, net	99,445	115,577
Other assets, net	7,785	8,093
Total assets	773,638	785,937
Current liabilities:
Current portion of long-term debt	9,844	9,928
Accounts payable	101,785	73,426
Accrued payroll and other compensation	24,806	17,198
Accrued taxes	10,125	5,638
Other accrued liabilities	39,214	23,668
Total current liabilities	185,774	129,858
Long-term debt	273,195	262,713
Long-term operating lease liabilities	17,369	18,424
Deferred tax liabilities	27,016	34,561
Benefit plan liabilities	18,770	18,957
Other long-term liabilities	3,201	3,004
Commitments and Contingencies (Note 16)
Stockholders' equity:
Preferred stock	0	0
Common stock	255	253
Capital in excess of par value	96,536	94,140
Retained earnings	266,641	340,629
Accumulated other comprehensive loss	(24,465)	(25,979)
Treasury stock, at cost	(90,654)	(90,623)
Total stockholders’ equity	248,313	318,420
Total liabilities and stockholders’ equity	$ 773,638	$ 785,937