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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of changes to the carrying amount of goodwill by reporting unit
The table below presents changes to the carrying amount of goodwill by segment during the nine months ended September 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
16,745

 
24

 
(198
)
 
 
16,571

Balance at September 30, 2019
$
2,655,163

 
$
187,678

 
$
96,866

 
 
$
2,939,707

 
(1)
The Company does not have any accumulated goodwill impairment losses.
Schedule of amortizable intangible assets
The tables below present reconciliations of the carrying amounts of the Company's finite-lived intangible assets as of the dates indicated (in thousands).
September 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
)
 
(18,680
)
 
(104,580
)
Foreign currency translation impact
 
(9,810
)
 
(303
)
 
(2
)
 
(106
)
 
(10,221
)
Gross cost
 
1,121,846

 
110,398

 
12,940

 
32,876

 
1,278,060

Accumulated amortization (1)
 
(255,139
)
 
(55,609
)
 
(9,973
)
 
(21,026
)
 
(341,747
)
Balance at September 30, 2019
 
$
866,707

 
$
54,789

 
$
2,967

 
$
11,850

 
$
936,313

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 three months)
$
31,812

2020
122,864

2021
102,493

2022
92,989

2023
92,989

Thereafter
493,166

 
$
936,313