Patents (Tables)
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Dec. 31, 2014
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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):
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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):
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