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Amortizable Intangible Assets
 3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Amortizable Intangible Assets Amortizable Intangible Assets
Amortizable intangible assets at March 31, 2019 and December 31, 2018 consisted of the following:
 
March 31, 2019
 
December 31, 2018
(in thousands)
Gross
carrying
value
 
Accumulated
amortization
 
Net
carrying
value
 
Weighted
average
life
(years)(1)
 
Gross
carrying
value
 
Accumulated
amortization
 
Net
carrying
value
 
Weighted
average
life
(years)(1)
Purchased customer accounts
$
1,838,732

 
$
(934,756
)
 
$
903,976

 
14.9
 
$
1,804,404

 
$
(909,415
)
 
$
894,989

 
14.9
Non-compete agreements
33,607

 
(29,945
)
 
3,662

 
4.5
 
33,469

 
(29,651
)
 
3,818

 
4.5
Total
$
1,872,339

 
$
(964,701
)
 
$
907,638

 
 
 
$
1,837,873

 
$
(939,066
)
 
$
898,807

 
 
(1)
Weighted average life calculated as of the date of acquisition.
Amortization expense for amortizable intangible assets for the years ending December 31, 2019, 2020, 2021, 2022 and 2023 is estimated to be $102.5 million, $95.4 million, $91.8 million, $87.3 million, and $80.3 million, respectively.