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Deferred Sales Commissions, Net
 12 Months Ended
Dec. 31, 2023
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, 2023 and 2022 were as follows (excluding amounts related to fully amortized deferred sales commissions):
Years Ended December 31
20232022
(in thousands)
Carrying amount of deferred sales commissions$187,870 $172,181 
Less: Accumulated amortization(66,899)(66,184)
Cumulative CDSC received(33,597)(53,747)
Deferred sales commissions, net$87,374 $52,250 
Amortization expense associated with deferred sales commissions was $36.8 million, $34.8 million and $34.4 million for the years ended December 31, 2023, 2022 and 2021, respectively.
Estimated future amortization expense related to the December 31, 2023 net asset balance, assuming no additional CDSC is received in future periods, is as follows (in thousands):
2024$39,894 
202528,979 
202616,997 
20271,504 
Total$87,374