CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 29,221	$ 37,984
Receivables (net of allowance of $1,501 and $1,416)	130,046	108,056
Revenue recognized in excess of billings on uncompleted contracts	14,200	6,998
Inventories	127,648	125,115
Other current assets	18,436	13,437
Total current assets	319,551	291,590
Property, plant and equipment, net	388,536	366,442
Intangibles, net	43,878	40,543
Goodwill	76,058	66,316
Deferred income taxes	11,630	7,957
Other assets	2,486	2,370
Total assets	842,139	775,218
Current liabilities:
Accounts payable and accrued liabilities	82,730	74,493
Billings in excess of revenue recognized on uncompleted contracts	5,386	4,063
Payroll and benefits payable	18,349	15,458
Accrued income taxes	2,841	1,641
Current portion of long-term debt	5,000	5,000
Total current liabilities	114,306	100,655
Long-term debt	240,873	220,000
Deferred income taxes	23,368	25,624
Accrued pension and other liabilities	52,731	47,796
Total liabilities	431,278	394,075
Commitments and contingencies (Note 11)
Stockholders' equity:
Common stock, $.01 par value, 100,000,000 shares authorized, 61,728,605 and 61,531,025 shares issued	617	615
Additional paid-in capital	189,492	185,791
Retained earnings	406,385	402,286
Treasury stock, at cost, 10,804,009 and 10,781,001 shares	(154,305)	(153,950)
Accumulated other comprehensive loss	(31,328)	(53,599)
Total stockholders' equity	410,861	381,143
Total liabilities and stockholders' equity	$ 842,139	$ 775,218