Consolidated Balance Sheets (unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 67,910	$ 45,518
Trade receivables, net	41,475	77,124
Other receivables	6,744	10,610
Inventories, net	107,721	85,630
Prepaid expenses and other current assets	9,319	8,688
Total current assets	233,169	227,570
Property, plant and equipment, net	158,994	163,567
Goodwill	40,863	43,912
Intangible assets, net	9,301	8,902
Deferred income taxes	35,318	38,424
Other non-current assets	3,438	4,697
Total assets	481,083	487,072
Current liabilities:
Accounts payable	43,435	43,670
Deferred revenue	29,684	14,095
Accrued expenses and other current liabilities	33,049	41,014
Total current liabilities	106,168	98,779
Long-term debt	60,000	60,000
Deferred income taxes	8,863	10,545
Accrued pension benefits	47,330	50,949
Other non-current liabilities	14,523	15,573
Total liabilities	236,884	235,846
Stockholders' equity:
Common stock, $.10 par value; authorized 100,000,000, issued 33,049,206 and 32,836,930 shares at respective dates	3,305	3,284
Additional paid-in capital	121,923	119,265
Retained earnings	196,474	188,481
Treasury stock, at cost, 1,738,624 and 1,738,624 shares at respective dates	(14,823)	(14,823)
Accumulated other comprehensive loss	(62,680)	(44,981)
Total stockholders' equity	244,199	251,226
Total liabilities and stockholders' equity	$ 481,083	$ 487,072