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Intangible Assets
 12 Months Ended
Dec. 31, 2013
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets
Intangible Assets

The following tables provide information regarding our intangible assets, other than goodwill:

 
December 31, 2012
(In thousands)
Gross carrying amount
 
Accumulated amortization
 
Net carrying amount
Intangible assets:
 
 
 
 
 
Licenses
$
30,620

 
$
(16,826
)
 
$
13,794

Purchased technologies
8,762

 
(5,062
)
 
3,700

Domain name purchases
446

 
(441
)
 
5

Non-compete agreements
1,900

 
(1,186
)
 
714

Customer relationships
5,725

 
(4,477
)
 
1,248

Trademarks, tradenames and patents
3,062

 
(1,671
)
 
1,391

Other
4,040

 
(1,090
)
 
2,950

Total
$
54,555

 
$
(30,753
)
 
$
23,802


 
December 31, 2013
(In thousands)
Gross carrying amount
 
Accumulated amortization
 
Net carrying amount
Intangible assets:
 
 
 
 
 
Licenses
$
31,443

 
$
(21,216
)
 
$
10,227

Purchased technologies
13,180

 
(7,428
)
 
5,752

Domain name purchases
442

 
(442
)
 
—

Non-compete agreements
2,165

 
(1,613
)
 
552

Customer relationships
6,137

 
(5,442
)
 
695

Trademarks, tradenames and patents
3,581

 
(1,985
)
 
1,596

Other
7,539

 
(2,481
)
 
5,058

Total
$
64,487

 
$
(40,607
)
 
$
23,880



Amortization expense on intangibles was $5.6 million, $8.9 million and $9.8 million in 2011, 2012 and 2013, respectively. Intangible assets are recorded at cost and are amortized on a straight-line basis over their estimated useful lives, which generally range from two to five years.

As of December 31, 2013, amortization expense on intangible assets for the next five years was expected to be as follows:

(In thousands)
 
Year ending:
Amount
2014
$
9,408

2015
8,504

2016
4,970

2017
536

2018
293

Thereafter
169

Total
$
23,880



As of December 31, 2013, there were no indicators that our intangible assets were impaired.