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Patents (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Patents [Line Items] |  |  |
Patents, weighted average useful life | 7 years |  |
Payments to acquire intangible assets | $ 178,260,000 | $ 14,680,000 | $ 8,224,000
Accrued patent acquisition related payments | 0 | 900,000 |
Accelerated amortization expense | 10,574,000 | 3,111,000 | 1,171,000
Accelerated amortization expense (termination) | 2,823,000 | 821,000 | 275,000
Patent cost, disposals | 5,500,000 | 4,612,000 | 1,540,000
Accumulated amortization, disposals | 2,466,000 | 3,509,000 | 1,108,000
Proceeds from patent sale | 3,347,000 | 11,000,000 | 240,000
Patent cost, sale | $ 0 | $ 4,717,000 | $ 94,000
Minimum [Member] |  |  |
Patents [Line Items] |  |  |
Patents, useful life | 1 year |  |
Acquired Finite Lived Intangible Asset, Useful Life | 1 year |  |
Maximum [Member] |  |  |
Patents [Line Items] |  |  |
Patents, useful life | 10 years |  |
Acquired Finite Lived Intangible Asset, Useful Life | 8 years |  |
Patents [Member] | Minimum [Member] |  |  |
Patents [Line Items] |  |  |
Patents, useful life | 1 year |  |
Patents [Member] | Maximum [Member] |  |  |
Patents [Line Items] |  |  |
Patents, useful life | 9 years |  |

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