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Patents (Tables)
 12 Months Ended
Dec. 31, 2018
Patents [Abstract]  
Patents The gross carrying amounts and accumulated amortization related to investments in intangible assets as of December 31, 2018 and 2017 are as follows (in thousands): 
 
 
2018
 
2017
 
 
 
 
 
Gross carrying amount - patents                                                        
 
$
326,167

 
$
444,137

Accumulated amortization - patents(1)                                                                         
 
(319,580
)
 
(382,220
)
Patents, net                                                                             
 
$
6,587

 
$
61,917
Patent costs and accumulated amortization related to patent sales and disposals [Table Text Block] For the years ended December 31, 2018 and 2017, capitalized patent costs, accumulated amortization and impairment charges, and sales proceeds related to patent-related sales and disposals are as follows (in thousands):
 
 
2018
 
2017
 
 
 
 
 
Capitalized patent costs
 
$
117,970

 
$
—

Accumulated amortization / impairment charges
 
109,663

 
—

Sales proceeds
 
14,500

 
—