Intangibles and Goodwill (Tables)
 3 Months Ended
Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of amortizable intangible assets
The following is a summary of amortizable intangible assets as of March 31, 2020 and December 31, 2019 (in thousands):
 March 31, 2020December 31, 2019
CostAccumulated AmortizationNetCostAccumulated AmortizationNet
Customer relationships$150,239  $(69,680) $80,559  $150,239  $(67,317) $82,922  
Carrier relationships18,300  (5,203) 13,097  18,300  (4,934) 13,366  
Non-compete agreements5,239  (3,952) 1,287  5,239  (3,765) 1,474  
Trade names5,640  (5,640) —  5,640  (5,640) —  
$179,418  $(84,474) $94,944  $179,418  $(81,656) $97,762  
Note: Amounts may not foot due to rounding.
Estimated amortization expense for the next five years and thereafter
The estimated amortization expense for the next five years and thereafter is as follows (in thousands):
Remainder of 2020  $8,155  
2021  10,362  
2022  10,005  
2023  9,501  
20248,897  
Thereafter48,023  
Total$94,944  
Note: Amounts may not foot due to rounding.