Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets :
Cash and cash equivalents	$ 31,585	$ 30,647
Restricted cash	1,000	0
Trade and other accounts receivable, net of allowance for doubtful accounts of $150 and $134, at March 31, 2014 and December 31, 2013, respectively	37,628	29,869
Inventories	45,003	44,736
Prepaid expenses and other current assets	2,336	2,314
Total current assets	117,552	107,566
Property and equipment, net	43,746	44,941
Intangible assets, net	318	369
Goodwill	26,201	25,978
Pension asset	10,919	10,568
Other non-current assets	666	665
Total assets	199,402	190,087
Current liabilities:
Accounts payable and accrued liabilities	27,433	25,436
Accrued warranty	512	180
Accrued employee compensation	8,598	8,788
Deferred Revenue and Credits	2,729	1,043
Short-term borrowings and current portion of long-term debt	10,540	7,914
Deferred tax liability	876	890
Total current liabilities	50,688	44,251
Deferred tax liability, long-term	2,153	2,125
Long-term debt, excluding current portion	83	100
Other long-term liabilities	3,686	3,401
Total liabilities	56,610	49,877
Commitments and contingencies (Note 8)
Stockholders' equity:
Common stock, $0.10 par value per share, 40,000 shares authorized; 29,930 and 29,563 shares issued and outstanding at March 31, 2014 and December 31, 2013, respectively	2,990	2,953
Additional paid-in capital	273,276	271,928
Accumulated deficit	(151,475)	(151,794)
Accumulated other comprehensive income	18,001	17,123
Total stockholders' equity	142,792	140,210
Total liabilities and stockholders' equity	$ 199,402	$ 190,087