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Patents (Tables)
12 Months Ended
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