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Patents (Tables) | 12 Months Ended
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Dec. 31, 2014
Patents [Abstract] |
Patents | The gross carrying amounts and accumulated amortization related to investments in intangible assets as of December 31, 2014 and 2013 are as follows (in thousands):
|  | 2014 |  | 2013
Gross carrying amount - patents |  | $ | 453,201 |  |  | $ | 400,755 |
Accumulated amortization - patents |  | (166,565 | ) |  | (112,323 | )
Patents, net |  | $ | 286,636 |  |  | $ | 288,432 |
Patent costs and accumulated amortization related to patent sales and disposals [Table Text Block] | For the years ended December 31, 2014, 2013 and 2012, capitalized patent costs and accumulated amortization, and sales proceeds and other costs, related to patent-related sales and disposals are as follows (in thousands):
|  | 2014 |  | 2013 |  | 2012
Capitalized patent costs |  | $ | 3,000 |  |  | $ | 3,500 |  |  | $ | 5,500 |
Accumulated amortization |  | 298 |  |  | 1,753 |  |  | 2,466 |
Sales proceeds |  | 3,500 |  |  | 1,000 |  |  | 2,792 |

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