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Goodwill and Long-lived Assets (Details 1) (USD $) | 3 Months Ended | 9 Months Ended |  |  |  | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended |  |  | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended |  |
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011 | Sep. 30, 2012 Existing technology | Dec. 31, 2011 Existing technology | Sep. 30, 2012 Existing technology Minimum | Dec. 31, 2011 Existing technology Minimum | Sep. 30, 2012 Existing technology Maximum | Dec. 31, 2011 Existing technology Maximum | Sep. 30, 2012 Customer contracts and contractual relationships | Dec. 31, 2011 Customer contracts and contractual relationships | Sep. 30, 2012 Customer contracts and contractual relationships Minimum | Dec. 31, 2011 Customer contracts and contractual relationships Minimum | Sep. 30, 2012 Customer contracts and contractual relationships Maximum | Dec. 31, 2011 Customer contracts and contractual relationships Maximum | Sep. 30, 2012 Non-compete agreements | Dec. 31, 2011 Non-compete agreements | Sep. 30, 2012 Intellectual property | Dec. 31, 2011 Intellectual property | Sep. 30, 2012 Favorable contracts | Dec. 31, 2011 Favorable contracts
Components of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful Life (in years) |  |  |  |  |  |  |  |  | 3 years | 3 years | 10 years | 10 years |  |  | 1 year | 1 year | 10 years | 10 years | 3 years | 3 years | 4 years | 4 years |  |
Gross Carrying Amount | $ 224,765,000 |  | $ 224,765,000 |  | $ 232,327,000 | $ 181,431,000 | [1] | $ 187,993,000 |  |  |  |  | $ 32,650,000 | $ 33,550,000 |  |  |  |  | $ 300,000 | $ 400,000 | $ 10,384,000 | $ 10,384,000 |  |
Accumulated Amortization | (64,357,000) |  | (64,357,000) |  | (50,372,000) | (40,766,000) | [1] | (32,682,000) |  |  |  |  | (13,074,000) | (7,148,000) |  |  |  |  | (133,000) | (158,000) | (10,384,000) | (10,384,000) |  |
Net Carrying Amount | 160,408,000 |  | 160,408,000 |  | 181,955,000 | 140,665,000 | [1] | 155,311,000 |  |  |  |  | 19,576,000 | 26,402,000 |  |  |  |  | 167,000 | 242,000 | 0 | 0 |  |
Amortization expense for intangible assets | 8,000,000 | 6,900,000 | 23,535,000 | 12,908,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,200,000 | $ 9,900,000
[1] | The Company recorded a non-cash intangible impairment charge of $15.4 million related to the LDT group as discussed above which has been netted from the gross carrying amount and accumulated amortization for existing technology.

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- Definition The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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