Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 74,141	$ 43,974
Trade receivables, less allowances of $341 and $304 at respective dates	110,622	90,920
Other receivables	6,748	7,278
Inventories, net	123,184	109,920
Prepaid expenses and other current assets	7,960	7,187
Total current assets	322,655	259,279
Property, plant and equipment, net	217,092	186,487
Goodwill	40,323	32,063
Intangible assets, net	14,800	6,691
Deferred income taxes	13,061	19,259
Other non-current assets	3,934	1,760
Total assets	611,865	505,539
Current liabilities:
Accounts payable	42,873	39,257
Deferred revenue and advance payments	7,506	16,298
Taxes payable	9,469	8,471
Accrued expenses and other current liabilities	35,614	35,776
Short-term debt		30,000
Total current liabilities	95,462	129,802
Advance payments	39,000
Deferred income taxes	6,921	7,735
Accrued pension benefits	43,109	42,661
Other non-current liabilities	21,946	14,506
Total liabilities	206,438	194,704
Commitments and contingencies (see Notes 20 and 21)
Stockholders' equity:
Common Stock, $.10 par value; authorized 100,000,000 issued 33,927,595 and 33,528,915 shares at respective dates	3,393	3,353
Additional paid-in capital	153,681	131,980
Retained earnings	327,376	245,698
Treasury stock, at cost, 1,583,909 and 1,729,727 shares at respective dates	(13,503)	(14,747)
Accumulated other comprehensive loss	(65,520)	(55,449)
Total stockholders' equity	405,427	310,835
Total liabilities and stockholders' equity	$ 611,865	$ 505,539