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Goodwill and Intangible Assets
12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
5. Goodwill and Intangible Assets
Changes in the carrying amount of goodwill during the years ended December 31, 2019 and 2018 are as follows (in thousands):
 Travel NetworkAirline Solutions
Hospitality
Solutions
Total
Goodwill
Balance as of December 31, 2017$2,104,822  $290,985  $159,180  $2,554,987  
Adjustments(1)
(33) 378  (2,963) (2,618) 
Balance as of December 31, 20182,104,789  291,363  156,217  2,552,369  
Acquired
—  82,402  —  82,402  
Adjustments(1)
(7) (107) (1,406) (1,520) 
Balance as of December 31, 2019$2,104,782  $373,658  $154,811  $2,633,251  
________________________
(1)Includes net foreign currency effects during the year. 
The following table presents our intangible assets as of December 31, 2019 and 2018 (in thousands):
 December 31, 2019December 31, 2018
 
Gross
Carrying
Amount
Accumulated
Amortization
Net
Carrying
Amount
Gross
Carrying
Amount
Accumulated
Amortization
Net
Carrying
Amount
Acquired customer relationships$1,046,382  $(735,367) $311,015  $1,033,555  $(709,824) $323,731  
Trademarks and brand names333,638  (147,735) 185,903  332,239  (137,009) 195,230  
Reacquired rights113,500  (73,124) 40,376  113,500  (56,910) 56,590  
Purchased technology437,288  (409,204) 28,084  426,488  (400,750) 25,738  
Acquired contracts, supplier and distributor agreements
37,599  (29,324) 8,275  37,600  (25,867) 11,733  
Non-compete agreements14,686  (14,686) —  14,686  (14,460) 226  
Total intangible assets$1,983,093  $(1,409,440) $573,653  $1,958,068  $(1,344,820) $613,248  
Amortization expense relating to intangible assets subject to amortization totaled $65 million, $68 million and $96 million for the years ended December 31, 2019, 2018 and 2017, respectively. Estimated amortization expense related to intangible assets subject to amortization for each of the five succeeding years and beyond is as follows (in thousands): 
2020$65,915  
202164,337  
202250,736  
202337,030  
202458,395  
2025 and thereafter 297,240  
Total$573,653