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Summary of Significant Accounting Policies (Details) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Minimum [Member] | Dec. 31, 2012 Minimum [Member] | Mar. 31, 2013 Maximum [Member] | Dec. 31, 2012 Maximum [Member]
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Vesting period of equity awards |  |  | 2 years |  | 4 years |
Useful life of patents and patent rights |  |  |  | 1 year |  | 9 years
Estimated annual effective tax rate | 39.00% |  |  |  |  |
Effective tax rate |  | 23.00% |  |  |  |
Excess tax benefits from stock-based compensation | $ 709,000 | $ 7,611,000 |  |  |  |
Cash paid for income taxes | 3,000,000 |  |  |  |  |
Business acquisition deferred tax asset |  | 1,900,000 |  |  |  |
Income tax benefit from release of valuation allowance | 0 | 10,237,000 |  |  |  |
Change in deferred tax liability, business acquisition |  | $ 8,300,000 |  |  |  |

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- Definition A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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