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Patents (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Patents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Patents, net | $ 162,642,000 |  |  |  | $ 286,636,000 |  |  |  | $ 162,642,000 | $ 286,636,000 |
Patents, weighted average useful life |  |  |  |  |  |  |  |  | 5 years |  |
Payments to acquire intangible assets |  |  |  |  |  |  |  |  | $ 19,504,000 | 42,746,000 | $ 25,061,000
Accrued patent acquisition related payments | 1,000,000 |  |  |  | 16,700,000 |  |  |  | 1,000,000 | 16,700,000 |
Accelerated amortization expense |  |  |  |  |  |  |  |  |  | 1,247,000 | 592,000
Accelerated amortization expense (termination) |  |  |  |  |  |  |  |  | 380,000 | 2,702,000 | 1,747,000
Impairment of Patent-Related Intangible Assets | 74,731,000 | $ 0 | $ 0 | $ 0 | 931,000 | $ 0 | $ 0 | $ 2,566,000 | $ 74,731,000 | 3,497,000 | $ 4,619,000
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Patents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Patents, useful life |  |  |  |  |  |  |  |  | 1 year |  |
Acquired Finite Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  | 2 years |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Patents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Patents, useful life |  |  |  |  |  |  |  |  | 10 years |  |
Acquired Finite Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  | 10 years |  |
Patents [Member] |  |  |  |  |  |  |  |  |  |  |
Patents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount - patents | 444,137,000 |  |  |  | 453,201,000 |  |  |  | $ 444,137,000 | 453,201,000 |
Accumulated amortization - patents | 281,495,000 |  |  |  | 166,565,000 |  |  |  | 281,495,000 | 166,565,000 |
Patents, net | $ 162,642,000 |  |  |  | $ 286,636,000 |  |  |  | $ 162,642,000 | $ 286,636,000 |
Patents [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Patents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Patents, useful life |  |  |  |  |  |  |  |  | 1 year |  |
Patents [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Patents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Patents, useful life |  |  |  |  |  |  |  |  | 8 years |  |

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