CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 102,176	$ 51,331
Accounts receivable, net of allowance for doubtful receivables of $2,402 and $1,842, respectively	116,947	107,786
Contract assets	32,403	28,245
Inventories	78,996	80,544
Taxes receivable	6,652	3,427
Prepaid expenses and other current assets	12,218	12,264
Total current assets	349,392	283,597
Property, plant and equipment, net	214,513	221,642
Operating lease right-of-use assets	22,243	23,116
Goodwill	87,595	133,912
Other intangible assets, net	95,121	115,577
Deferred income tax assets	1,260	1,933
Other assets, net	5,338	6,160
Total assets	775,462	785,937
Current liabilities:
Current portion of long-term debt	9,789	9,928
Accounts payable	101,905	73,426
Accrued payroll and other compensation	24,589	17,198
Accrued taxes	8,214	5,638
Derivative liabilities	11,996	6,355
Restructuring liabilities	9,431	108
Other accrued liabilities	21,705	17,205
Total current liabilities	187,629	129,858
Long-term debt, excluding current portion, net of debt issuance costs	260,649	262,713
Long-term lease liability	17,947	18,424
Deferred income tax liabilities	27,174	34,561
Benefit plan liabilities	21,691	18,957
Other long-term liabilities	2,676	3,004
Commitments and Contingencies (Note 17)
Stockholders’ equity:
Preferred stock, $0.01 per share par value, 500 shares authorized; none issued or outstanding) (Note 11)	0	0
Common stock, $0.01 per share par value, 30,000 shares authorized; 25,555 and 25,328 shares issued, respectively) (Note 11)	256	253
Capital in excess of par value	99,770	94,140
Retained earnings	266,904	340,629
Accumulated other comprehensive loss	(18,342)	(25,979)
Less treasury stock, 7,717 and 7,705 shares of common stock, respectively, at cost	(90,892)	(90,623)
Total stockholders’ equity	257,696	318,420
Total liabilities and stockholders’ equity	$ 775,462	$ 785,937