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GOODWILL AND INTANGIBLE ASSETS (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Goodwill as of December 31, 2017 and 2016, and changes in the carrying amount of goodwill during the years ended December 31, 2017 and 2016, were as follows (in thousands):
Balance as of December 31, 2015
$
172,197

Goodwill measurement period adjustment
146

Effect of currency translation
(1,676
)
Balance as of December 31, 2016
$
170,667

Goodwill acquired
42,007

Goodwill measurement period adjustment
(178
)
Goodwill related to disposed asset group
(110,768
)
Effect of currency translation
6,226

Balance as of December 31, 2017
$
107,954
Schedule of Intangible Assets
Intangible assets at December 31, 2017 and 2016 consisted of the following (dollars in thousands):
 
As of December 31, 2017
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Weighted
Average
Remaining
Life
Business relationships
$
9,918

 
$
(896
)
 
$
9,022

 
10.3 years
Developed technology
7,832

 
(2,071
)
 
5,761

 
4.1 years
Content
4,005

 
(3,610
)
 
395

 
1.8 years
Domain and data licenses
2,869

 
(1,847
)
 
1,022

 
2.2 years
Trademarks
877

 
(287
)
 
590

 
2.2 years
User relationships
146

 
(43
)
 
103

 
2.2 years
Total
$
25,647

 
$
(8,754
)
 
$
16,893

 
 


 
As of December 31, 2016
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Weighted
Average
Remaining
Life
Business relationships
$
17,400

 
$
(2,741
)
 
$
14,659

 
10.1 years
User relationships
12,000

 
(3,240
)
 
8,760

 
5.1 years
Developed technology
9,280

 
(4,122
)
 
5,158

 
3.1 years
Content
3,674

 
(2,581
)
 
1,093

 
2.0 years
Trademarks
3,338

 
(1,861
)
 
1,477

 
2.1 years
Domain and data licenses
2,804

 
(1,340
)
 
1,464

 
3.0 years
Advertiser relationships
1,549

 
(1,549
)
 
—

 
0.0 years
Total
$
50,045

 
$
(17,434
)
 
$
32,611

 
 
Schedule of Future Amortization Expense
As of December 31, 2017, the estimated future amortization of purchased intangible assets for (i) each of the succeeding five years and (ii) thereafter is as follows (in thousands):
Year Ending December 31,
Amount
2018
$
3,533

2019
3,277

2020
2,402

2021
2,262

2022
1,045

Thereafter
4,374

Total amortization
$
16,893