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Other Intangible Assets, Net
 6 Months Ended
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangible Assets, Net Other Intangible Assets, Net
Other intangible assets, net consists of the following:
June 30, 2020December 31, 2019
(in thousands)GrossAccumulated AmortizationNetGrossAccumulated AmortizationNet
Client lists$655,182  $(367,000) $288,182  $662,611  $(354,011) $308,600  
Non-compete agreements26,752  (18,900) 7,852  26,409  (16,249) 10,160  
Tradenames and licenses127,311  (72,290) 55,021  127,176  (67,118) 60,058  
 $809,245  $(458,190) $351,055  $816,196  $(437,378) $378,818  

Amortization expense for other intangible assets, net was $14.3 million and $15.4 million for the three months ended June 30, 2020 and 2019, respectively, and $28.6 million and $32.0 million for the six months ended June 30, 2020 and 2019, respectively.

Impairment losses of $35.6 million were recorded for both the three and six months ended June 30, 2019. For the three and six months ended June 30, 2020, there were no impairments. See Note 6 - Fair Value for further discussion.

Estimated amortization expense for other intangible assets, net is as follows:
(in thousands) 
Remainder of 2020$28,862  
202154,276  
202252,492  
202344,248  
202437,875  
Thereafter133,302  
 $351,055