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Intangible Assets
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets consist of the following (in thousands):
December 31,
20212020
Customer relationships$320,323 $342,492 
Other5,374 7,906 
325,697 350,398 
Accumulated amortization(110,909)(103,483)
Intangible assets, net$214,788 $246,915 
During 2021, we periodically assessed whether any indicators of impairment existed related to our intangible assets. As of each interim period end during the year, we concluded that a triggering event had not occurred that would more likely than not reduce the fair value of our intangible assets below their carrying values.
Amortization expense recognized in 2021, 2020 and 2019 was $32,045,000, $37,535,000 and $23,671,000, respectively.
Future amortization expense for the remaining unamortized balance as of December 31, 2021 is estimated as follows (in thousands):
Years Ending December 31,
Amortization
Expense
2022$31,166 
202329,764 
202428,310 
202527,990 
202627,990 
Thereafter69,568 
Total amortization expense$214,788