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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Amounts of Goodwill
The changes in carrying amounts of goodwill for the six months ended June 30, 2022 are as follows (in thousands):
Digital MediaCybersecurity and MartechConsolidated
Balance as of January 1, 2022$996,659 $534,796 $1,531,455 
Goodwill acquired (Note 3)81,725 — 81,725 
Purchase accounting adjustments(1)
1,773 (137)1,636 
Foreign exchange translation(2,584)(8,892)(11,476)
Balance as of June 30, 2022$1,077,573 $525,767 $1,603,340 
(1)Purchase accounting adjustments relate to measurement period adjustments to goodwill in connection with prior business acquisitions. Refer to Note 3 - Business Acquisitions.
Intangible Assets Subject to Amortization
As of June 30, 2022, intangible assets subject to amortization relate primarily to the following (in thousands):
Weighted-Average
  Amortization
Period		Historical
Cost		Accumulated
Amortization		Net
Trade names10.0 years$260,802 $113,181 $147,621 
Customer relationships (1)
8.0 years690,343 441,821 248,522 
Other purchased intangibles8.8 years480,781 340,184 140,597 
Total$1,431,926 $895,186 $536,740 
(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, 2021, intangible assets subject to amortization relate primarily to the following (in thousands):
Weighted-Average
  Amortization
Period
Historical
Cost		Accumulated
Amortization		Net
Trade names9.7 years$250,418 $102,657 $147,761 
Customer relationships (1)
8.1 years673,847 398,396 275,451 
Other purchased intangibles9.3 years467,028 317,515 149,513 
Total$1,391,293 $818,568 $572,725 
(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 5.0 years, despite the overall life of the asset.