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Patents (Tables)
 12 Months Ended
Dec. 31, 2016
Patents [Abstract]  
Patents
The gross carrying amounts and accumulated amortization related to investments in intangible assets as of December 31, 2016 and 2015 are as follows (in thousands): 
 
 
2016
 
2015
 
 
 
 
 
Gross carrying amount - patents                                                                             
 
$
444,362

 
$
444,137

Accumulated amortization - patents(1)                                                                         
 
(358,043
)
 
(281,495
)
Patents, net                                                                             
 
$
86,319

 
$
162,642
Patent costs and accumulated amortization related to patent sales and disposals [Table Text Block]
For the years ended December 31, 2016, 2015 and 2014, capitalized patent costs, accumulated amortization, and sales proceeds related to patent-related sales and disposals are as follows (in thousands):
 
 
2016
 
2015
 
2014
 
 
 
 
 
 
 
Capitalized patent costs
 
$
—

 
$
500

 
$
3,000

Accumulated amortization
 
—

 
120

 
298

Sales proceeds
 
—

 
750

 
3,500