CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 24,079	$ 37,984
Receivables (net of allowance of $1,459 and $1,416)	114,950	108,056
Revenue recognized in excess of billings on uncompleted contracts	11,514	6,998
Inventories	138,213	125,115
Other current assets	20,032	13,437
Total current assets	308,788	291,590
Property, plant and equipment, net	385,367	366,442
Intangibles, net	42,615	40,543
Goodwill	72,518	66,316
Deferred income taxes	8,997	7,957
Other assets	2,331	2,370
Total assets	820,616	775,218
Current liabilities:
Accounts payable and accrued liabilities	83,001	74,493
Billings in excess of revenue recognized on uncompleted contracts	4,299	4,063
Payroll and benefits payable	12,592	15,458
Accrued income taxes	2,589	1,641
Current portion of long-term debt	5,000	5,000
Total current liabilities	107,481	100,655
Long-term debt	241,367	220,000
Deferred income taxes	23,601	25,624
Accrued pension and other liabilities	52,189	47,796
Total liabilities	424,638	394,075
Commitments and contingencies (Note 11)
Stockholders' equity:
Common stock, $.01 par value, 100,000,000 shares authorized, 61,713,754 and 61,531,025 shares issued	617	615
Additional paid-in capital	188,228	185,791
Retained earnings	403,821	402,286
Treasury stock, at cost, 10,803,922 and 10,781,001 shares	(154,304)	(153,950)
Accumulated other comprehensive loss	(42,384)	(53,599)
Total stockholders' equity	395,978	381,143
Total liabilities and stockholders' equity	$ 820,616	$ 775,218