Intangibles and Goodwill (Tables)
 6 Months Ended
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of amortizable intangible assets
The following is a summary of amortizable intangible assets as of June 30, 2020 and December 31, 2019 (in thousands):
 June 30, 2020December 31, 2019
CostAccumulated AmortizationNetCostAccumulated AmortizationNet
Customer relationships$150,239  $(72,020) $78,219  $150,239  $(67,317) $82,922  
Carrier relationships18,300  (5,472) 12,828  18,300  (4,934) 13,366  
Non-compete agreements5,239  (4,109) 1,130  5,239  (3,765) 1,474  
Trade names5,640  (5,640) —  5,640  (5,640) —  
$179,418  $(87,241) $92,177  $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$5,389  
202110,362  
202210,005  
20239,501  
20248,897  
Thereafter48,023  
Total$92,177