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Deferred Acquisition Costs and Value of Business Acquired
 12 Months Ended
Dec. 31, 2017
Business Combinations [Abstract]  
Deferred Acquisition Costs and Value of Business Acquired
Deferred Acquisition Costs and Value of Business Acquired
 
The following table summarizes activity in DAC and VOBA: 
 
 
DAC
 
VOBA
 
Total
Balances, January 1, 2015
 
$
353,408

 
$
25,286

 
$
378,694

Capitalized additions
 
63,093

 
—

 
63,093

Amortization and writedowns
 
(96,095
)
 
(4,493
)
 
(100,588
)
Unrealized investment (gains) losses
 
73,012

 
(68
)
 
72,944

Balances, December 31, 2015
 
393,418

 
20,725

 
414,143

Capitalized additions
 
93,222

 
—

 
93,222

Amortization and writedowns
 
(29,317
)
 
(1,992
)
 
(31,309
)
Unrealized investment (gains) losses
 
10,522

 
112

 
10,634

Balances, December 31, 2016
 
467,845

 
18,845

 
486,690

Capitalized additions
 
105,814

 
—

 
105,814

Amortization and writedowns
 
(20,862
)
 
1,134

 
(19,728
)
Unrealized investment (gains) losses
 
(54,358
)
 
92

 
(54,266
)
Balances, December 31, 2017
 
$
498,439

 
$
20,071

 
$
518,510

 
The estimated future amortization of VOBA for the years ended December 31, 2018 through December 31, 2022, is approximately $3,800 per annum.