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Value of Business Acquired
 12 Months Ended
Dec. 31, 2016
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, were as follows:
 
2016
 
2015
 
2014
 
 
 
 
 
 
 
(in thousands)
Balance, beginning of year
$
33,640

 
$
39,738

 
$
43,500

Amortization-Impact of assumption and experience unlocking and true-ups (1)
2,372

 
3,412

 
5,412

Amortization-All other (1)
(8,176
)
 
(10,477
)
 
(11,181
)
Interest (2)
1,939

 
2,436

 
2,615

Change in unrealized investment gains and losses
512

 
1,163

 
(608
)
Ceded VOBA upon reinsurance agreement with Prudential Insurance (3)
0

 
(2,632
)
 
0

Balance, end of year
$
30,287

 
$
33,640

 
$
39,738


(1)
The weighted average remaining expected life of VOBA was approximately 5.13 years as of December 31, 2016.
(2)
The interest accrual rate for the VOBA related to the businesses acquired was 6.00%, 6.05% and 6.10% for the years ended December 31, 2016, 2015 and 2014.
(3)
See Note 1 for additional information.
The following table provides estimated future amortization, net of interest, for the periods indicated:
 
2017
 
2018
 
2019
 
2020
 
2021
 
 
 
 
 
 
 
 
 
 
 
(in thousands)
Estimated future VOBA amortization
$
5,464

 
$
4,728

 
$
3,972

 
$
3,350

 
$
2,817