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Value of Business Acquired
 12 Months Ended
Dec. 31, 2017
Present Value of Future Insurance Profits [Abstract]  
Value of Business Acquired
VALUE OF BUSINESS ACQUIRED
The balances of and changes in VOBA as of and for the years ended December 31, are as follows:
 
2017
 
2016
 
2015
 
 
 
 
 
 
 
(in thousands)
Balance, beginning of year
$
30,287

 
$
33,640

 
$
39,738

Amortization-Impact of assumption and experience unlocking and true-ups (1)
10,035

 
2,372

 
3,412

Amortization-All other (1)
(7,422
)
 
(8,176
)
 
(10,477
)
Interest (2)
2,001

 
1,939

 
2,436

Change in unrealized investment gains and losses
208

 
512

 
1,163

Ceded VOBA upon reinsurance agreement with Prudential Insurance (3)
0

 
0

 
(2,632
)
Balance, end of year
$
35,109

 
$
30,287

 
$
33,640


(1)
The weighted average remaining expected life of VOBA was approximately 5.47 years as of December 31, 2017.
(2)
The interest accrual rate for the VOBA related to the businesses acquired was 5.96%, 6.00% and 6.05% for the years ended December 31, 2017, 2016 and 2015.
(3)
See Note 1 for additional information.
The following table provides estimated future amortization, net of interest, for the periods indicated:
 
2018
 
2019
 
2020
 
2021
 
2022
 
 
 
 
 
 
 
 
 
 
 
(in thousands)
Estimated future VOBA amortization
$
5,867

 
$
4,997

 
$
4,258

 
$
3,620

 
$
3,077