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Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Schedule of accumulated balances for each classification of other comprehensive income (loss)
The following table presents the accumulated balances for each classification of other comprehensive income (loss):
 
 
Year Ended December 31, 2017
 
 
Unrealized holding gains (losses) arising on
fixed maturities, available-for-sale (1)
 
Unrealized holding gains (losses) arising on cash flow hedged (2)
 
Future policy benefits, DAC and VOBA adjustments
 
Employee benefit plan adjustment (3)
 
Total
Balances, January 1, 2015
 
$
784,183

 
$
33,141

 
$
(108,194
)
 
$
(106,112
)
 
$
603,018

OCI before reclassifications
 
(643,880
)
 
31,061

 
65,245

 
19,730

 
(527,844
)
Deferred income tax benefit (expense)
 
225,358

 
(10,871
)
 
(22,836
)
 
(6,905
)
 
184,746

   AOCI before reclassification, net of tax
 
(418,522
)
 
20,190

 
42,409

 
12,825

 
(343,098
)
Amounts reclassified from AOCI
 
(40,217
)
 
(12,380
)
 
—

 
11,856

 
(40,741
)
Deferred income tax benefit (expense)
 
14,076

 
4,333

 
—

 
(4,150
)
 
14,259

   Amounts reclassified from AOCI, net of tax
 
(26,141
)
 
(8,047
)
 
—

 
7,706

 
(26,482
)
Balances, December 31, 2015
 
339,520

 
45,284

 
(65,785
)
 
(85,581
)
 
233,438

OCI before reclassifications
 
20,295

 
44,776

 
10,983

 
(7,315
)
 
68,739

Deferred income tax benefit (expense)
 
(7,103
)
 
(15,672
)
 
(3,844
)
 
2,560

 
(24,059
)
   AOCI before reclassification, net of tax
 
13,192

 
29,104

 
7,139

 
(4,755
)
 
44,680

Amounts reclassified from AOCI
 
(63,022
)
 
(11,249
)
 
—

 
9,281

 
(64,990
)
Deferred income tax benefit (expense)
 
22,058

 
3,937

 
—

 
(3,248
)
 
22,747

   Amounts reclassified from AOCI, net of tax
 
(40,964
)
 
(7,312
)
 
—

 
6,033

 
(42,243
)
Balances, December 31, 2016
 
311,748

 
67,076

 
(58,646
)
 
(84,303
)
 
235,875

OCI before reclassifications
 
377,605

 
(73,726
)
 
(88,648
)
 
7,283

 
222,514

Deferred income tax benefit (expense)
 
(132,162
)
 
25,804

 
31,027

 
(2,549
)
 
(77,880
)
   AOCI before reclassification, net of tax
 
245,443

 
(47,922
)
 
(57,621
)
 
4,734

 
144,634

Amounts reclassified from AOCI
 
(29,710
)
 
(4,498
)
 
—

 
6,982

 
(27,226
)
Deferred income tax benefit (expense)
 
10,399

 
1,574

 
—

 
(2,444
)
 
9,529

   Amounts reclassified from AOCI, net of tax
 
(19,311
)
 
(2,924
)
 
—

 
4,538

 
(17,697
)
Impact of tax reform
 
7,007

 
87,299

 
—

 
(16,161
)
 
78,145

Balances, December 31, 2017
 
$
544,887

 
$
103,529

 
$
(116,267
)
 
$
(91,192
)
 
$
440,957


(1) Reclassifications affect Other realized investment gains(losses), net on the consolidated statements of income.
(2) Reclassifications affect net investment income on the consolidated statements of income, except for $2,954 and $2,657 (before tax) which affected interest expense for the years ended December 31, 2017 and 2016, respectively.
(3) The adjustments for defined benefit plans are included in the computation of net periodic (benefit) cost of employee benefit plans (see note 17 for additional details).