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Patents
3 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Identifiable Intangible Assets
PATENTS

Acacia’s only identifiable intangible assets at March 31, 2017 and December 31, 2016 are patents and patent rights.  Patent-related accumulated amortization totaled $363,558,000 and $358,043,000 as of March 31, 2017 and December 31, 2016, respectively.

Acacia’s patents have remaining estimated economic useful lives ranging from one to seven years.  The weighted-average remaining estimated economic useful life of Acacia’s patents is approximately five years.  The following table presents the scheduled annual aggregate amortization expense as of March 31, 2017 (in thousands):
For the years ending December 31,
 
Remainder of 2017
$
16,819

2018
21,256

2019
19,150

2020
6,707

2021
5,421

Thereafter
11,451

 
$
80,804