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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Amounts of Goodwill
The changes in carrying amounts of goodwill for the nine months ended September 30, 2023 are as follows (in thousands):
Digital MediaCybersecurity and MartechConsolidated
Balance as of January 1, 2023$1,065,989 $525,485 $1,591,474 
Goodwill acquired (Note 3)
6,258 — 6,258 
Goodwill impairment(56,850)— (56,850)
Purchase accounting adjustments (1)
(72)— (72)
Foreign exchange translation(644)(503)(1,147)
Balance as of September 30, 2023$1,014,681 $524,982 $1,539,663 
(1)Purchase accounting adjustments relate to measurement period adjustments to goodwill in connection with prior business acquisitions.
Intangible Assets Subject to Amortization
As of September 30, 2023, intangible assets subject to amortization relate primarily to the following (in thousands):
Weighted-Average
  Amortization
Period		Historical
Cost		Accumulated
Amortization		Net
Trade names10 years$265,406 $142,201 $123,205 
Customer relationships (1)
8 years690,942 533,565 157,377 
Other purchased intangibles9 years476,529 389,168 87,361 
Total$1,432,877 $1,064,934 $367,943 
(1)The Company amortizes customer relationship assets in a pattern that best reflects the pace at which the asset’s benefits are consumed. This pattern results in a substantial majority of the amortization expense being recognized in the first 4 to 5 years, despite the overall life of the asset.
As of December 31, 2022, intangible assets subject to amortization relate primarily to the following (in thousands):
Weighted-Average
  Amortization
Period
Historical
Cost		Accumulated
Amortization		Net
Trade names10 years$261,614 $125,422 $136,192 
Customer relationships (1)
8 years687,798 479,741 208,057 
Other purchased intangibles8 years481,973 363,407 118,566 
Total$1,431,385 $968,570 $462,815 
(1)The Company amortizes customer relationship assets in a pattern that best reflects the pace at which the asset’s benefits are consumed. This pattern results in a substantial majority of the amortization expense being recognized in the first 4 to 5 years, despite the overall life of the asset.