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Deferred Policy Acquisition Costs (Tables)
 12 Months Ended
Dec. 31, 2019
Deferred Policy Acquisition Costs Disclosures [Abstract]  
Schedule of Deferred Acquisition Costs Table
The balances of and changes in DAC as of and for the years ended December 31, are as follows:
 
2019
 
2018
 
2017
 
(in thousands)
Balance, beginning of year
$
4,447,505

 
$
4,596,565

 
$
4,344,361

Capitalization of commissions, sales and issue expenses
412,627

 
372,996

 
277,586

Amortization-Impact of assumption and experience unlocking and true-ups
245,276

 
(113,534
)
 
288,974

Amortization-All other
(518,129
)
 
(476,261
)
 
(275,028
)
Change in unrealized investment gains and losses
(131,596
)
 
67,739

 
(39,328
)
Balance, end of year
$
4,455,683

 
$
4,447,505

 
$
4,596,565