Income Taxes (Components of deferred tax assets and liabilities) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Components of Deferred Tax Assets and Liabilities [Abstract]
Net operating loss carryforwards	$ 162,655,000	$ 163,661,000
Capital loss carryforwards	18,221,000	18,221,000
Income tax credits	20,591,000	22,366,000
Property, plant and equipment	19,020,000	20,065,000
Accrued liabilities	40,185,000	35,805,000
Unrealized foreign exchange loss	5,437,000	6,486,000
Other	16,160,000	17,522,000
Total deferred tax assets	282,269,000	284,126,000
Valuation allowance	(214,269,000)	(223,612,000)
Total deferred tax assets net of valuation allowance	68,000,000	60,514,000
Property, plant and equipment	4,532,000	3,460,000
Deferred gain	6,899,000	6,899,000
Other	13,954,000	7,478,000
Total deferred tax liabilities	25,385,000	17,837,000
Net deferred tax assets	42,615,000	42,677,000
Other current assets	13,541,000	8,438,000
Other assets	45,627,000	42,750,000
Other current liabilities	(10,044,000)	(5,683,000)
Other non-current liabilities	(6,509,000)	(2,828,000)
Valuation Allowance, Deferred Tax Asset, Change in Amount	(9,300,000)	14,700,000	(52,700,000)
Valuation Allowance Share Based Compensation [Member]
Components of Deferred Tax Assets and Liabilities [Abstract]
Valuation Allowance, Amount	7,200,000
Taiwan
Components of Deferred Tax Assets and Liabilities [Abstract]
Valuation Allowance, Deferred Tax Asset, Change in Amount		(3,000,000)
Korea
Components of Deferred Tax Assets and Liabilities [Abstract]
Valuation Allowance, Deferred Tax Asset, Change in Amount			(25,600,000)
United States
Components of Deferred Tax Assets and Liabilities [Abstract]
Valuation Allowance, Deferred Tax Asset, Change in Amount			$ (22,700,000)