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Selected Quarterly Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Selected Quarterly Data
The following is an unaudited summary of quarterly results for the two years ended December 31, 2017. The information includes all adjustments (consisting of normal accruals) which management considers necessary for a fair presentation of the results of operations for these periods.
 
Three Months Ended
 
March 31,
 
June 30,
 
September 30,
 
December 31,
2017:
 
 
 
 
 
 
 
Premium income
$
820,631

 
$
816,614

 
$
819,217

 
$
826,473

Net investment income
208,282

 
212,776

 
213,872

 
212,955

Realized investment gains (losses)
(5,748
)
 
(705
)
 
12,595

 
17,469

Total revenue
1,023,581

 
1,029,078

 
1,046,015

 
1,056,899

Policyholder benefits
557,776

 
556,415

 
551,219

 
562,465

Amortization of deferred acquisition costs
125,908

 
122,121

 
122,334

 
120,040

Pretax income from continuing operations
191,741

 
201,926

 
220,610

 
216,371

Income from continuing operations
137,178

 
140,363

 
153,346

 
1,027,376

Income from discontinued operations
(3,637
)
 
(90
)
 
(12
)
 
(30
)
Net income
133,541

 
140,273

 
153,334

 
1,027,346

Basic net income per common share:
 
 
 
 
 
 
 
Continuing operations
1.16

 
1.20

 
1.32

 
8.93

Discontinued operations
(0.03
)
 
—

 
—

 
—

Total basic net income per common share
1.13

 
1.20

 
1.32

 
8.93

Diluted net income per common share:
 
 
 
 
 
 
 
Continuing operations
1.14

 
1.18

 
1.29

 
8.71

Discontinued operations
(0.03
)
 
—

 
—

 
—

Total diluted net income per common share
1.11

 
1.18

 
1.29

 
8.71

 
Three Months Ended
 
March 31,
 
June 30,
 
September 30,
 
December 31,
2016:
 
 
 
 
 
 
 
Premium income
$
779,860

 
$
785,855

 
$
783,411

 
$
787,908

Net investment income
197,053

 
201,642

 
202,720

 
205,488

Realized investment gains (losses)
293

 
4,005

 
3,482

 
(18,463
)
Total revenue
977,627

 
991,884

 
989,773

 
975,345

Policyholder benefits
524,973

 
531,485

 
532,152

 
540,138

Amortization of deferred acquisition costs
118,806

 
117,245

 
116,821

 
116,191

Pretax income from continuing operations
195,448

 
199,344

 
201,461

 
175,982

Income from continuing operations
133,574

 
139,294

 
141,910

 
124,812

Income from discontinued operations
(9,541
)
 
(865
)
 
9,959

 
10,636

Net income
124,033

 
138,429

 
151,869

 
135,448

Basic net income per common share:
 
 
 
 
 
 
 
Continuing operations
1.10

 
1.16

 
1.19

 
1.05

Discontinued operations
(0.08
)
 
(0.01
)
 
0.08

 
0.09

Total basic net income per common share
1.02

 
1.15

 
1.27

 
1.14

Diluted net income per common share:
 
 
 
 
 
 
 
Continuing operations
1.08

 
1.13

 
1.16

 
1.03

Discontinued operations
(0.07
)
 
—

 
0.09

 
0.09

Total diluted net income per common share
1.01

 
1.13

 
1.25

 
1.12