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Deferred Policy Acquisition Costs, Deferred Sales Inducements and Lifetime Income Benefit Rider Reserves (Tables)
 12 Months Ended
Dec. 31, 2017
Insurance [Abstract]  
Deferred Policy Acquisition Costs
Policy acquisition costs deferred and amortized are as follows:
 
December 31,
 
2017
 
2016
 
2015
 
(Dollars in thousands)
Balance at beginning of year
$
2,905,377

 
$
2,905,136

 
$
2,058,556

Costs deferred during the year:
 
 
 
 
 
Commissions
401,124

 
538,863

 
651,094

Policy issue costs
5,517

 
4,462

 
6,545

Amortization
(255,964
)
 
(374,012
)
 
(286,114
)
Effect of net unrealized gains/losses
(341,531
)
 
(169,072
)
 
475,055

Balance at end of year
$
2,714,523

 
$
2,905,377

 
$
2,905,136
Deferred Sales Inducements
Sales inducements deferred and amortized are as follows:
 
December 31,
 
2017
 
2016
 
2015
 
(Dollars in thousands)
Balance at beginning of year
$
2,208,218

 
$
2,232,148

 
$
1,587,257

Costs deferred during the year
216,172

 
353,966

 
486,924

Amortization
(176,612
)
 
(251,166
)
 
(209,390
)
Effect of net unrealized gains/losses
(245,886
)
 
(126,730
)
 
367,357

Balance at end of year
$
2,001,892

 
$
2,208,218

 
$
2,232,148