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Deferred Sales Commissions, Net
 12 Months Ended
Dec. 31, 2020
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, 2020 and 2019 were as follows (excluding amounts related to fully amortized deferred sales commissions):
December 31,
20202019
(in thousands)
Carrying amount of deferred sales commissions$116,484 $68,371 
Less: Accumulated amortization(30,001)(19,348)
Cumulative CDSC received(22,417)(12,727)
Deferred sales commissions, net$64,066 $36,296 

Amortization expense was $27.4 million, $15.0 million and $21.3 million for the years ended December 31, 2020, 2019 and 2018, respectively. Estimated future amortization expense related to the December 31, 2020 net asset balance, assuming no additional CDSC is received in future periods, is as follows (in thousands):
2021$28,980 
202223,631 
202310,787 
2024668 
$64,066