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Deferred Policy Acquisition Costs
 12 Months Ended
Dec. 31, 2018
Insurance [Abstract]  
Deferred Policy Acquisition Costs
Deferred Policy Acquisition Costs
Deferred policy acquisition costs are shown below (in thousands):
 
 
Life
 
Annuity
 
Health
 
Property
& Casualty
 
Total
Balance at December 31, 2015
 
$
756,023

 
$
411,206

 
$
44,390

 
$
113,050

 
$
1,324,669

Additions
 
108,825

 
77,161

 
11,203

 
263,024

 
460,213

Amortization
 
(112,712
)
 
(71,381
)
 
(14,973
)
 
(262,299
)
 
(461,365
)
Effect of change in unrealized gains on available-for-sale debt securities
 
(6,296
)
 
(22,778
)
 
—

 
—

 
(29,074
)
Net change
 
(10,183
)
 
(16,998
)
 
(3,770
)
 
725

 
(30,226
)
Balance at December 31, 2016
 
745,840

 
394,208

 
40,620

 
113,775

 
1,294,443

Additions
 
123,854

 
104,772

 
11,413

 
285,796

 
525,835

Amortization
 
(74,068
)
 
(74,750
)
 
(15,227
)
 
(280,306
)
 
(444,351
)
Effect of change in unrealized gains on available-for-sale debt securities
 
(4,350
)
 
2,267

 
—

 
—

 
(2,083
)
Net change
 
45,436

 
32,289

 
(3,814
)
 
5,490

 
79,401

Balance at December 31, 2017
 
791,276

 
426,497

 
36,806

 
119,265

 
1,373,844

Additions
 
131,156

 
92,603

 
12,590

 
315,305

 
551,654

Amortization
 
(97,263
)
 
(57,468
)
 
(15,436
)
 
(309,990
)
 
(480,157
)
Effect of change in unrealized gains on available-for-sale debt securities
 
13,964

 
37,956

 
—

 
—

 
51,920

Net change
 
47,857

 
73,091

 
(2,846
)
 
5,315

 
123,417

Balance at December 31, 2018
 
$
839,133

 
$
499,588

 
$
33,960

 
$
124,580

 
$
1,497,261


Commissions comprise the majority of the additions to deferred policy acquisition costs.