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Patents
3 Months Ended
Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Identifiable Intangible Assets

Acacia’s only identifiable intangible assets at March 31, 2014 and December 31, 2013 are patents.  Patent-related accumulated amortization totaled $126,795,000 and $112,323,000 as of March 31, 2014 and December 31, 2013, respectively.

Acacia’s patents have remaining estimated economic useful lives ranging from one to ten years.  The weighted-
average remaining estimated economic useful life of Acacia’s patents is approximately seven years.  The following table presents the scheduled annual aggregate amortization expense as of March 31, 2014 (in thousands):
Remainder of 2014
$
37,371

2015
48,586

2016
45,503

2017
44,293

2018
40,421

Thereafter
74,023

Total
$
290,197



For the three months ended March 31, 2014 and 2013, Acacia paid patent investment costs totaling $987,000 and $4,010,000, respectively.  The underlying patents have estimated economic useful lives of approximately four to ten years. Included in net additions to capitalized patent costs during the three months ended March 31, 2014 are accrued patent investment costs totaling $15,250,000, which are amortized over the estimated economic useful life of the related patents.

During the three months ended March 31, 2014 and 2013, certain operating subsidiaries recovered up-front patent portfolio advances from applicable net licensing proceeds prior to the scheduled amortization of such up-front patent portfolio advances, resulting in the acceleration of amortization expense for the applicable patent related assets. Accelerated amortization expense related to the recovery of up-front patent portfolio advances totaled $48,000 and $483,000 for the three months ended March 31, 2014 and 2013, respectively. Included in amortization of patents for the three months ended March 31, 2014 was accelerated amortization related to the partial write-down of a patent portfolio, due to a reduction in expected estimated future net cash flows, totaling $2,565,000.