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Amortizable Intangible Assets and Goodwill (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010 | Dec. 31, 2010 | Jun. 30, 2011 Patents | Dec. 31, 2010 Patents | Jun. 30, 2011 Customer contracts and contractual relationships | Dec. 31, 2010 Customer contracts and contractual relationships | Jun. 30, 2011 Existing technology | Dec. 31, 2010 Existing technology | Jun. 30, 2011 Intellectual property | Dec. 31, 2010 Intellectual property | Jun. 30, 2011 Non-competition agreements | Dec. 31, 2010 Non-competition agreements
Components of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Amount | $ 228,117,000 |  | $ 228,117,000 |  | $ 68,917,000 | $ 24,433,000 | $ 24,433,000 | $ 33,550,000 | $ 4,050,000 | $ 159,350,000 | $ 29,950,000 | $ 10,384,000 | $ 10,384,000 | $ 400,000 | $ 100,000
Accumulated Amortization | (33,912,000) |  | (33,912,000) |  | (27,931,000) | (11,167,000) | (9,361,000) | (3,782,000) | (3,127,000) | (8,471,000) | (4,959,000) | (10,384,000) | (10,384,000) | (108,000) | (100,000)
Net Carrying Amount | 194,205,000 |  | 194,205,000 |  | 40,986,000 | 13,266,000 | 15,072,000 | 29,768,000 | 923,000 | 150,879,000 | 24,991,000 |  |  | 292,000 |
Minimum useful life (in years) |  |  |  |  |  | 3 | 3 | 1 | 1 | 3 | 3 |  |  |  |
Maximum useful life (in years) |  |  |  |  |  | 10 | 10 | 10 | 10 | 7 | 7 |  |  |  |
Useful life (in years) |  |  |  |  |  |  |  |  |  |  |  | 4 | 4 | 3 | 3
Amortization expense for intangible assets | 4,000,000 | 1,200,000 | 6,000,000 | 2,300,000 |  |  |  |  |  |  |  |  |  |  |
Estimated future amortization expense of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2011 (remaining 6 months) |  |  | 16,179,000 |  |  |  |  |  |  |  |  |  |  |  |
2012 |  |  | 34,536,000 |  |  |  |  |  |  |  |  |  |  |  |
2013 |  |  | 31,471,000 |  |  |  |  |  |  |  |  |  |  |  |
2014 |  |  | 27,330,000 |  |  |  |  |  |  |  |  |  |  |  |
2015 |  |  | 26,679,000 |  |  |  |  |  |  |  |  |  |  |  |
Thereafter |  |  | 58,010,000 |  |  |  |  |  |  |  |  |  |  |  |
Total |  |  | $ 194,205,000 |  |  |  |  |  |  |  |  |  |  |  |

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