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Business Segments and Major Customers (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2011 Customer group source year | Sep. 30, 2010 Customer | Sep. 30, 2011 Customer step year statement group source | Sep. 30, 2010 Customer | Dec. 31, 2010 group source
Business Segments and Major Customers |  |  |  |  |
Number of business groups (in groups) | 2 |  | 2 |  | 2
Financial information of business segments |  |  |  |  |
Revenues | $ 100,263 | $ 31,743 | $ 229,004 | $ 232,469 |
Gain from settlement |  | 10,300 | 6,200 | 116,500 | 126,800
Segment operating income | 84,727 | 31,305 | 192,669 | 316,982 |
Operating income (loss) | 10,736 | (11,494) | 16,598 | 183,999 |
Interest and other expense, net | (6,178) | (4,641) | (17,991) | (13,656) |
Income (loss) before income taxes | 4,558 | (16,135) | (1,393) | 170,343 |
Property, plant and equipment, net | 72,494 |  | 72,494 |  | 67,770
Number of major customers | 3 | 4 | 4 | 1 |
Semiconductor Business Group ("SBG") |  |  |  |  |
Financial information of business segments |  |  |  |  |
Revenues | 84,628 | 31,668 | 212,779 | 232,207 |
Gain from settlement |  | 10,300 | 6,200 | 116,500 |
Segment operating income | 75,456 | 32,906 | 190,101 | 321,166 |
Operating income (loss) | 75,456 | 32,906 | 190,101 | 321,166 |
New Business Group ("NBG") |  |  |  |  |
Financial information of business segments |  |  |  |  |
Revenues | 15,635 | 75 | 16,225 | 262 |
Segment operating income | 9,271 | (1,601) | 2,568 | (4,184) |
Operating income (loss) | 9,271 | (1,601) | 2,568 | (4,184) |
Reconciling items |  |  |  |  |
Financial information of business segments |  |  |  |  |
Operating income (loss) | (73,991) | (42,799) | (176,071) | (132,983) |
Unallocated amounts: Corporate expenses |  |  |  |  |
Financial information of business segments |  |  |  |  |
Operating income (loss) | (44,602) | (25,260) | (104,992) | (79,667) |
Unallocated amounts: Unallocated expenses |  |  |  |  |
Financial information of business segments |  |  |  |  |
Operating income (loss) | (29,389) | (17,539) | (71,079) | (53,316) |
Customer 1 |  |  |  |  |
Financial information of business segments |  |  |  |  |
Revenue of major customer as a percentage of total revenue (as a percent) | 25.00% | 47.00% | 30.00% | 72.00% |
Customer 2 |  |  |  |  |
Financial information of business segments |  |  |  |  |
Revenue of major customer as a percentage of total revenue (as a percent) | 25.00% | 12.00% | 11.00% |  |
Customer 3 |  |  |  |  |
Financial information of business segments |  |  |  |  |
Revenue of major customer as a percentage of total revenue (as a percent) | 12.00% | 11.00% | 11.00% |  |
Customer 4 |  |  |  |  |
Financial information of business segments |  |  |  |  |
Revenue of major customer as a percentage of total revenue (as a percent) |  | 10.00% | 11.00% |  |
North America |  |  |  |  |
Financial information of business segments |  |  |  |  |
Revenues | 54,559 | 5,025 | 82,655 | 15,801 |
Korea |  |  |  |  |
Financial information of business segments |  |  |  |  |
Revenues | 24,641 | 14,853 | 68,859 | 166,732 |
Japan |  |  |  |  |
Financial information of business segments |  |  |  |  |
Revenues | 19,899 | 11,819 | 76,149 | 49,692 |
Europe |  |  |  |  |
Financial information of business segments |  |  |  |  |
Revenues | 997 | 11 | 1,011 | 151 |
Asia-Other |  |  |  |  |
Financial information of business segments |  |  |  |  |
Revenues | 167 | 35 | 330 | 93 |
United States |  |  |  |  |
Financial information of business segments |  |  |  |  |
Property, plant and equipment, net | 71,200 |  | 71,200 |  | 66,700
Revenue from a country in North America as a minimum percentage of total revenue | 10.00% | 10.00% | 10.00% |  |
India |  |  |  |  |
Financial information of business segments |  |  |  |  |
Property, plant and equipment, net | 1,300 |  | 1,300 |  | 1,000
Other foreign locations |  |  |  |  |
Financial information of business segments |  |  |  |  |
Property, plant and equipment, net |  |  |  |  | $ 100
Canada |  |  |  |  |
Financial information of business segments |  |  |  |  |
Revenue from a country in North America as a minimum percentage of total revenue | 10.00% |  |  |  |

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