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Value of Business Acquired
 12 Months Ended
Dec. 31, 2015
Insurance [Abstract]  
Value of Business Acquired
VALUE OF BUSINESS ACQUIRED
Details of VOBA and related interest and gross amortization for the years ended December 31, are as follows:
 
2015
 
2014
 
2013
 
 
 
 
 
 
 
(in thousands)
Balance, beginning of year
$
39,738

 
$
43,500

 
$
43,090

Amortization-Impact of assumption and experience unlocking and true-ups (1)
3,412

 
5,412

 
6,376

Amortization-All other (1)
(10,477
)
 
(11,181
)
 
(11,593
)
Interest (2)
2,436

 
2,615

 
2,762

Change in unrealized investment gains and losses
1,163

 
(608
)
 
2,865

Ceded VOBA upon Reinsurance Treaty with Prudential Insurance (3)
(2,632
)
 
0

 
0

Balance, end of year
$
33,640

 
$
39,738

 
$
43,500

(1)
The weighted average remaining expected life of VOBA was approximately 5.22 years as of December 31, 2015.
(2)
The interest accrual rate for the VOBA related to the businesses acquired was 6.05%, 6.1% and 6.14% for the years ended December 31, 2015, 2014 and 2013.
(3)
See Note 1 for further details.
The following table provides estimated future amortization, net of interest, for the periods indicated (in thousands):
 
2016
 
2017
 
2018
 
2019
 
2020
 
 
 
 
 
 
 
 
 
 
 
(in thousands)
Estimated future VOBA amortization
$
5,570

 
$
4,797

 
$
4,171

 
$
3,510

 
$
2,956