CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities
Net income	$ 45,713	$ 23,272	$ 39,224
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	28,938	26,320	24,337
Employee benefit plan provisions	2,451	5,431	2,026
Stock-based compensation	3,128	2,434	2,577
Excess tax benefit from stock-based compensation			143
Deferred income tax expense	4,935	443	13,354
Restructuring (Note 2)	(129)	10,211
Restructuring cash payments (Note 2)	(3,140)	(1,616)
Changes in assets and liabilities - net of effects from foreign exchange:
Decrease (increase) in receivables	1,805	(828)	(6,371)
(Increase) decrease in inventories	(5,269)	10,320	(15,041)
Decrease (increase) in revenue in excess of billings on uncompleted contracts and other current assets	8,380	(5,715)	(2,296)
(Decrease) increase in accounts payable and accrued liabilities	(14,235)	4,201	7,680
Pension contributions	(4,717)	(3,913)	(8,087)
Other items - net	(1,082)	2,117	(4,526)
Net cash provided by operating activities	66,778	72,677	53,020
Cash flows from investing activities
Proceeds from sale of business - net of cash (Note 2)	642
Capital expenditures	(30,271)	(60,680)	(72,101)
Government grants received	1,709	947	2,189
Cash pledged for collateral			(21)
Cash released from collateral		1,152
Net cash used in investing activities	(27,920)	(58,581)	(69,933)
Cash flows from financing activities
Proceeds of debt obligations	10,476		373
Reductions of debt obligations	(5,876)	(3,202)	(3,034)
Treasury stock purchased	(3,334)	(577)	(422)
Common stock issued	4,066	1,601	2,074
Accelerated share repurchase (Note 10)		(50,000)
Excess tax benefit from stock-based compensation			(143)
Net cash used in financing activities	(26,885)	(10,174)	(476)
Effect of exchange rate changes on cash	2,808	665	(3,029)
Increase (decrease) in cash and cash equivalents	14,781	4,587	(20,418)
Cash and cash equivalents, beginning of year	18,161	13,574	33,992
Cash and cash equivalents, end of year	32,942	18,161	13,574
Japanese Revolving credit facility - short-term (note 7)
Cash flows from financing activities
Revolving credit facility borrowings	4,925	10,546	179,550
Revolving credit facility repayments	(19,142)	(12,792)	(178,874)
U.S. Revolving credit facility - long-term (note 7)
Cash flows from financing activities
Revolving credit facility borrowings	113,047	125,550
Revolving credit facility repayments	$ (131,047)	$ (81,300)