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Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of intangible assets
Intangibles as of September 30, 2013, consist of the following:
 
Gross
 
Accumulated
Amortization
 
Net
 
(In thousands)
Patents and technology rights
$
22,361

 
$
(18,861
)
 
$
3,500

Customer relationships
8,000

 
(7,442
)
 
558

Total intangibles
$
30,361

 
$
(26,303
)
 
$
4,058


Intangibles as of December 31, 2012, consist of the following:
 
Gross
 
Accumulated
Amortization
 
Net
 
(In thousands)
Patents and technology rights
$
22,169

 
$
(19,636
)
 
$
2,533

Customer relationships
8,000

 
(5,767
)
 
2,233

Total intangibles
$
30,169

 
$
(25,403
)
 
$
4,766
Estimated future amortization of intangible assets
Based on the amortizing assets recognized in our balance sheet at September 30, 2013, amortization for each of the next five years is estimated as follows:
 
Amortization
 
(In thousands)
2013 remaining
$
928

2014
1,022

2015
731

2016
513

2017
477

Thereafter
387

Total amortization
$
4,058