CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 49,237	$ 59,875
Accounts receivable, (net of allowance for doubtful receivables of $1,440 and $1,507, respectively)	144,938	116,712
Contract assets	23,040	0
Inventories	84,465	80,339
Taxes receivable	2,912	5,525
Prepaid expenses and other current assets	12,486	11,044
Total current assets	317,078	273,495
Property, plant and equipment, net	213,369	170,332
Goodwill	196,963	68,969
Other intangible assets, net	136,604	40,543
Deferred tax assets	2,055	1,146
Other assets, net	6,617	6,386
Total assets	872,686	560,871
Current liabilities:
Current portion of long-term debt	10,172	277
Accounts payable	73,265	71,931
Accrued payroll and other compensation	16,621	15,978
Accrued taxes	3,095	2,230
Deferred revenue	6,990	3,412
Other accrued liabilities	11,203	8,278
Total current liabilities	121,346	102,106
Long-term debt	314,641	76,913
Deferred tax liabilities	39,265	14,714
Benefit plan liabilities	22,795	9,743
Other long-term liabilities	5,364	3,999
Commitments and Contingencies (Note 15)
Stockholders’ equity:
Preferred stock (par value $0.01 per share; authorized 500 shares; none issued or outstanding) (Note 9)	0	0
Common stock (par value $0.01 per share; authorized 30,000 shares; issued 25,254 and 25,018 shares, respectively) (Note 9)	253	250
Capital in excess of par value	90,851	88,006
Retained earnings	411,325	374,783
Accumulated other comprehensive loss	(42,685)	(20,148)
Treasury stock, 7,698 and 7,675 shares of common stock, respectively, at cost	(90,469)	(89,495)
Total stockholders’ equity	369,275	353,396
Total liabilities and stockholders’ equity	$ 872,686	$ 560,871