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Goodwill and Other Intangible Assets
6 Months Ended
Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets
Goodwill
Goodwill is generally not deductible for tax purposes. The following table presents the goodwill activity for the periods presented (in thousands):
Goodwill—December 31, 2015
$
1,507,093

Acquisitions
90,365

Other
(35
)
Goodwill—June 30, 2016
$
1,597,423



Other Intangible Assets
The following table presents the detail of other intangible assets for the periods presented (dollars in thousands):
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Weighted-
Average
Remaining
Life (1)
June 30, 2016:
 
 
 
 
 
 
 
Customer and subscriber relationships
$
226,500

 
$
(81,792
)
 
$
144,708

 
2.5 years
Developed technology
173,192

 
(118,744
)
 
54,448

 
1.0 year
Content (2)
98,000

 
(52,675
)
 
45,325

 
1.9 years
Patents
63,128

 
(12,884
)
 
50,244

 
8.8 years
Other intangible assets
13,434

 
(12,217
)
 
1,217

 
2.8 years
Total
$
574,254

 
$
(278,312
)
 
$
295,942

 
3.2 years
December 31, 2015:
 
 
 
 
 
 
 
Customer and subscriber relationships
$
226,100

 
$
(46,139
)
 
$
179,961

 
2.9 years
Developed technology
165,187

 
(88,361
)
 
76,826

 
1.4 years
Content (2)
98,000

 
(30,625
)
 
67,375

 
2.4 years
Patents
56,878

 
(10,120
)
 
46,758

 
9.5 years
Other intangible assets
13,434

 
(11,267
)
 
2,167

 
1.4 years
Total
$
559,599

 
$
(186,512
)
 
$
373,087

 
3.2 years

 __________________
(1)
The weighted-average remaining life of other intangible assets excludes the impact of $0.8 million in indefinite-lived intangible assets, which consists of domain names, as of June 30, 2016 and December 31, 2015.
(2)
The amortization method for the content intangible asset is 50% the first year, 30% the second year, and 20% in the third year. The remaining definite-lived intangible assets are amortized using the straight-line method.
Amortization expense for the three months ended June 30, 2016 and 2015 was $44.4 million and $29.5 million, respectively, and $91.8 million and $41.3 million for the six months ended June 30, 2016 and 2015, respectively. Estimated amortization expense of intangible assets for future periods as of June 30, 2016, is as follows (in thousands):
Year Ending December 31,
Amortization Expense
Remainder of 2016
$
81,861

2017
107,644

2018
55,300

2019
21,400

2020
5,946

Thereafter
23,015

Total
$
295,166