Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities
Net income	$ 7,738	$ 8,477
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,513	5,540
Employee benefit plan provisions	936	411
Stock-based compensation	622	615
Deferred income tax expense	1,146	3,258
Changes in assets and liabilities-net of effects from foreign exchange:
Decrease in receivables	2,834	4,598
Increase in inventories	(5,767)	(4,547)
Increase in revenue in excess of billings on uncompleted contracts and other current assets	(4,212)	(810)
Decrease in accounts payable, accrued liabilities, and accrued interest	(4,009)	(8,035)
Pension contributions	(397)	(1,420)
Other items - net	(238)	(517)
Net cash provided by operating activities	5,166	7,570
Cash flows from investing activities
Property, plant and equipment expenditures	(11,811)	(12,665)
Government grants received	215
Net cash used in investing activities	(11,596)	(12,665)
Cash flows from financing activities
Revolving credit facility borrowings	23,294	138,961
Revolving credit facility repayments	(17,312)	(138,912)
Reductions of debt obligations	(776)	(778)
Treasury stock purchased	(418)	(422)
Common stock issued	421	89
Excess tax benefit from stock-based compensation	(68)	121
Net cash provided by (used in) financing activities	5,141	(941)
Effect of exchange rate changes on cash and cash equivalents	(496)	(942)
Decrease in cash and cash equivalents	(1,785)	(6,978)
Cash and cash equivalents, beginning of period	13,574	33,992
Cash and cash equivalents, end of period	$ 11,789	$ 27,014