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Patents (Tables) | 12 Months Ended
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Dec. 31, 2017
Patents [Abstract] |
Patents | The gross carrying amounts and accumulated amortization related to investments in intangible assets as of December 31, 2017 and 2016 are as follows (in thousands):
|  | 2017 |  | 2016
Gross carrying amount - patents |  | $ | 444,137 |  |  | $ | 444,362 |
Accumulated amortization - patents(1) |  | (382,220 | ) |  | (358,043 | )
Patents, net |  | $ | 61,917 |  |  | $ | 86,319 |

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