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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of changes to the carrying amount of goodwill by reporting unit
The following table presents changes to the carrying amount of goodwill by segment during the six months ended June 30, 2019 (in thousands):
 
Research
 
Conferences
 
Consulting
 
 
Total
Balance at December 31, 2018 (1)
$
2,638,418

 
$
187,654

 
$
97,064

 
 
$
2,923,136

Foreign currency translation impact
7,194

 
16

 
(49
)
 
 
7,161

Balance at June 30, 2019
$
2,645,612

 
$
187,670

 
$
97,015

 
 
$
2,930,297

 
(1)
The Company does not have any accumulated goodwill impairment losses.
Schedule of amortizable intangible assets
The following tables present reconciliations of the carrying amounts of the Company's finite-lived intangible assets as of the dates indicated (in thousands):
June 30, 2019
 
Customer
Relationships
 
Software
 
Content
 
Other
 
Total
Gross cost at December 31, 2018
 
$
1,131,656

 
$
110,701

 
$
98,842

 
$
51,662

 
$
1,392,861

Intangible assets fully amortized
 
—

 
—

 
(85,900
)
 
(18,074
)
 
(103,974
)
Foreign currency translation impact
 
(3,573
)
 
(113
)
 
(1
)
 
35

 
(3,652
)
Gross cost
 
1,128,083

 
110,588

 
12,941

 
33,623

 
1,285,235

Accumulated amortization (1)
 
(232,450
)
 
(50,090
)
 
(8,922
)
 
(20,336
)
 
(311,798
)
Balance at June 30, 2019
 
$
895,633

 
$
60,498

 
$
4,019

 
$
13,287

 
$
973,437

December 31, 2018
 
Customer
Relationships
 
Software
 
Content
 
Other
 
Total
Gross cost
 
$
1,131,656

 
$
110,701

 
$
98,842

 
$
51,662

 
$
1,392,861

Accumulated amortization (1)
 
(184,918
)
 
(38,901
)
 
(92,717
)
 
(33,760
)
 
(350,296
)
Balance at December 31, 2018
 
$
946,738

 
$
71,800

 
$
6,125

 
$
17,902

 
$
1,042,565


 

(1) Finite-lived intangible assets are amortized using the straight-line method over the following periods: Customer relationships—4 to 13 years; Software—3 to 7 years; Content—1.5 to 5 years; and Other—2 to 11 years.
Schedule of estimated future amortization expense by year The estimated future amortization expense by year for finite-lived intangible assets is as follows (in thousands):
2019 (remaining six months)
$
64,032

2020
123,397

2021
102,993

2022
93,467

2023
93,467

Thereafter
496,081

 
$
973,437