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Patents (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Patents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Patents, net | $ 86,319,000 |  |  |  | $ 162,642,000 |  |  |  | $ 86,319,000 | $ 162,642,000 |
Patents, weighted average useful life |  |  |  |  |  |  |  |  | 5 years |  |
Payments to acquire intangible assets |  |  |  |  |  |  |  |  | $ 1,225,000 | 19,504,000 | $ 42,746,000
Accrued patent acquisition related payments |  |  |  |  | 1,000,000 |  |  |  |  | 1,000,000 | 16,700,000
Accelerated amortization expense |  |  |  |  |  |  |  |  | 225,000 | 0 | 1,247,000
Accelerated amortization expense (termination) |  |  |  |  |  |  |  |  | 0 | 380,000 | 2,702,000
Impairment of Patent-Related Intangible Assets | 2,175,000 | $ 0 | $ 40,165,000 | $ 0 | 74,731,000 | $ 0 | $ 0 | $ 0 | $ 42,340,000 | 74,731,000 | $ 3,497,000
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 | 444,362,000 |  |  |  | 444,137,000 |  |  |  | $ 444,362,000 | 444,137,000 |
Accumulated amortization - patents | 358,043,000 |  |  |  | 281,495,000 |  |  |  | 358,043,000 | 281,495,000 |
Patents, net | $ 86,319,000 |  |  |  | $ 162,642,000 |  |  |  | $ 86,319,000 | $ 162,642,000 |
Patents [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Patents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Patents, useful life |  |  |  |  |  |  |  |  | 1 year |  |
Patents [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Patents [Line Items] |  |  |  |  |  |  |  |  |  |  |
Patents, useful life |  |  |  |  |  |  |  |  | 7 years |  |

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