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Goodwill and Intangible Assets, Net (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill and Intangible Assets
The following table presents our goodwill and intangible assets as of December 31, 2017 and 2016: 
 
December 31,
 
2017
 
2016
 
(In thousands)
Goodwill
$
8,228,865

 
$
7,942,023

Intangible assets with indefinite lives
1,478,729

 
1,457,072

Intangible assets with definite lives, net
829,807

 
989,580

 
$
10,537,401

 
$
10,388,675
Changes in Goodwill by Reportable Segment
The following table presents the changes in goodwill by reportable segment:
 
Core OTA
 
trivago
 
HomeAway
 
Egencia
 
Total
 
(In thousands)
Balance as of January 1, 2016
$
4,717,371

 
$
539,577

 
$
2,602,712

 
$
133,281

 
$
7,992,941

Additions
128

 
—

 
—

 
—

 
128

Foreign exchange translation and other
(14,028
)
 
(23,339
)
 
(12,127
)
 
(1,552
)
 
(51,046
)
Balance as of December 31, 2016
4,703,471

 
516,238

 
2,590,585

 
131,729

 
7,942,023

Additions
123,617

 
298

 
—

 
—

 
123,915

Foreign exchange translation and other
12,949

 
72,113

 
64,649

 
13,216

 
162,927

Balance as of December 31, 2017
$
4,840,037

 
$
588,649

 
$
2,655,234

 
$
144,945

 
$
8,228,865
Components of Intangible Assets with Definite Lives
The following table presents the components of our intangible assets with definite lives as of December 31, 2017 and 2016:
 
December 31, 2017
 
December 31, 2016
 
Cost
 
Accumulated
Amortization
 
Net
 
Cost
 
Accumulated
Amortization
 
Net
 
(In thousands)
Customer relationships
$
665,027

 
$
(304,130
)
 
$
360,897

 
$
622,117

 
$
(185,468
)
 
$
436,649

Supplier relationships
655,467

 
(367,609
)
 
287,858

 
618,543

 
(289,834
)
 
328,709

Technology
531,735

 
(440,852
)
 
90,883

 
480,823

 
(355,471
)
 
125,352

Domain names
131,944

 
(70,203
)
 
61,741

 
117,109

 
(53,607
)
 
63,502

Other
451,915

 
(423,487
)
 
28,428

 
446,617

 
(411,249
)
 
35,368

Total
$
2,436,088

 
$
(1,606,281
)
 
$
829,807

 
$
2,285,209

 
$
(1,295,629
)
 
$
989,580
Estimated Future Amortization Expense Related to Intangible Assets
The estimated future amortization expense related to intangible assets with definite lives as of December 31, 2017, assuming no subsequent impairment of the underlying assets, is as follows, in thousands:
2018
$
279,126

2019
172,834

2020
133,859

2021
88,895

2022
72,411

2023 and thereafter
82,682

Total
$
829,807