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Goodwill and Other Identifiable Intangible Assets (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2013 Minimum [Member] | Dec. 31, 2013 Minimum [Member] | Jun. 30, 2013 Maximum [Member] | Dec. 31, 2013 Maximum [Member]
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Patents, accumulated amortization | $ 91,658,000 |  | $ 91,658,000 |  | $ 69,850,000 |  |  |  |
Useful life of patents and patent rights |  |  |  |  |  |  | 1 year |  | 9 years
Weighted average useful life of patents and patent rights |  |  | 7 years |  |  |  |  |  |
Patent acquisition costs paid |  |  | 6,260,000 | 40,435,000 |  |  |  |  |
Finite lived intangible asset acquired during the year, useful life |  |  |  |  |  | 1 year |  | 10 years |
Patent acquisition costs included in accrued expenses |  |  | 8,508,000 | 10,200,000 |  |  |  |  |
Accelerated amortization expense - up-front payments | 142,000 | 0 | 612,000 | 442,000 |  |  |  |  |
Accelerated amortization expense (termination) |  |  | $ 956,000 |  |  |  |  |  |

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- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -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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