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Deferred Sales Commissions, Net
 12 Months Ended
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Deferred Sales Commissions, Net
Deferred Sales Commissions, Net

The components of deferred sales commissions, net for the years ended December 31, 2018 and 2017 were as follows (excluding amounts related to fully amortized deferred sales commissions):
 
December 31,
 
2018
 
2017
 
(in thousands)
Carrying amount of deferred sales commissions
$
926,188

 
$
911,852

Less: Accumulated amortization
(618,910
)
 
(597,566
)
Cumulative CDSC received
(290,130
)
 
(284,160
)
Deferred sales commissions, net
$
17,148

 
$
30,126



Amortization expense was $21.3 million, $31.9 million and $41.1 million for the years ended December 31, 2018, 2017 and 2016, respectively. Estimated future amortization expense related to the December 31, 2018 net asset balance, assuming no additional CDSC is received in future periods, is as follows (in thousands):
2019
$
9,675

2020
4,561

2021
2,608

2022
237

2023
51

2024
16

 
$
17,148