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Other Intangible Assets, Net
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangible Assets, Net Other Intangible Assets, Net
The carrying amount of other intangible assets consisted of the following:
Useful life in yearsDecember 31, 2021
(In thousands)Gross
amount		Accumulated
amortization		Net carrying
amount
Customer relationships
8 - 14
$357,991 $(272,732)$85,259 
Trademark
2 - 15
41,901 (36,684)5,217 
Software packages
3 - 10
326,320 (217,643)108,677 
Non-compete agreement1556,539 (42,404)14,135 
Other intangible assets, net$782,751 $(569,463)$213,288 
Useful life in yearsDecember 31, 2020
(In thousands)Gross
amount		Accumulated
amortization		Net carrying
amount
Customer relationships
8 - 14
$343,981 $(246,088)$97,893 
Trademark
2 - 15
42,036 (35,467)6,569 
Software packages
3 - 10
289,205 (191,662)97,543 
Non-compete agreement1556,539 (38,635)17,904 
Other intangible assets, net$731,761 $(511,852)$219,909 
Amortization expense related to intangibles, including software packages, was $57.6 million, $54.1 million, and $51.5 million for the years ended December 31, 2021, 2020 and 2019, respectively. Amortization expense related to software packages was $26.0 million, $21.7 million, and $18.3 million for the years ended December 31, 2021, 2020 and 2019, respectively. The estimated amortization expense of balances outstanding at December 31, 2021 for the next five years are as follows:
(In thousands) 
2022$52,534 
202347,157 
202435,139 
202512,074 
20265,607