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Business Segment and Geographic Region Information (Details 2) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Revenue and long-lived assets by geographic region |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 44,624,000 | $ 44,640,000 | $ 59,114,000 | $ 55,007,000 | $ 60,411,000 | $ 72,455,000 | $ 93,380,000 | $ 93,170,000 | $ 203,385,000 | $ 319,416,000 | $ 275,212,000
Long-Lived Assets | 44,192,000 |  |  |  | 55,468,000 |  |  |  | 44,192,000 | 55,468,000 | 50,974,000
International revenue, amount |  |  |  |  |  |  |  |  | 142,800,000 | 231,000,000 | 208,500,000
International revenue, percentage |  |  |  |  |  |  |  |  | 70.20% | 72.30% | 75.80%
United States |  |  |  |  |  |  |  |  |  |  |
Revenue and long-lived assets by geographic region |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 132,159,000 | 234,132,000 | 190,819,000
Long-Lived Assets | 43,440,000 |  |  |  | 54,472,000 |  |  |  | 43,440,000 | 54,472,000 | 50,532,000
Europe |  |  |  |  |  |  |  |  |  |  |
Revenue and long-lived assets by geographic region |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 27,636,000 | 31,505,000 | 33,822,000
Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Revenue and long-lived assets by geographic region |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 43,590,000 | 53,779,000 | 50,571,000
Long-Lived Assets | $ 752,000 |  |  |  | $ 996,000 |  |  |  | $ 752,000 | $ 996,000 | $ 442,000

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