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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Deferred policy acquisition costs asset by segment The Company's deferred policy acquisition costs (DAC) by operating segment was as follows: 
($ in thousands)
 
December 31,
 
 
2017
 
2016
 
 
 
 
 
Retirement (annuity)
 
$
174,661

 
$
188,117

Life
 
53,974

 
51,859

Property and Casualty
 
29,191

 
27,604

Total
 
$
257,826

 
$
267,580
Adjustment to amortization expenses The Company recorded the following adjustments to amortization expense as a result of evaluating actual experience and prospective assumptions, the impact of unlocking: 
 ($ in thousands)
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
Increase (decrease) to amortization expense:
 
 

 
 

 
 

Retirement
 
$
1,081

 
$
(313
)
 
$
3,403

Life
 
(200
)
 
(394
)
 
(34
)
Total
 
$
881

 
$
(707
)
 
$
3,369
Allocation of goodwill by reporting unit The allocation of goodwill by reporting unit is as follows: 
($ in thousands)
 
 
 
 
 
Retirement
 
$
28,025

Life
 
9,911

Property and Casualty
 
9,460

Total
 
$
47,396
Property and Equipment The following amounts are included in Other assets in the Consolidated Balance Sheets: 
($ in thousands)
 
December 31,
 
 
2017
 
2016
 
 
 
 
 
Property and equipment
 
$
133,803

 
$
120,712

Less: accumulated depreciation
 
94,862

 
88,524

Total
 
$
38,941

 
$
32,188
Investment Contract And Life Policy Reserves This table summarizes the Company's investment contract and life policy reserves.
($ in thousands)
 
December 31,
 
 
2017
 
2016
 
 
 
 
 
Investment contract reserves
 
$
4,452,972

 
$
4,360,456

Life policy reserves
 
1,120,763

 
1,087,513

Total
 
$
5,573,735

 
$
5,447,969
Summary of guaranteed minimum death benefit The Company regularly monitors the GMDB reserve considering fluctuations in financial markets. The Company has a relatively low exposure to GMDB risk as shown below.
($ in thousands)
 
December 31,
 
 
2017
 
2016
 
 
 
 
 
GMDB reserve
 
$
152

 
$
225

Aggregate in-the-money death benefits under the GMDB provision
 
28,345

 
32,106

Variable annuity contract value distribution based on GMDB feature:
 
 
 
 
No guarantee
 
29
%
 
32
%
Return of premium guarantee
 
65
%
 
62
%
Guarantee of premium roll-up at an annual rate of 3% or 5%
 
6
%
 
6
%
Total
 
100
%
 
100
%
Stock options fair value pricing model weighted-average assumptions The fair value of stock options granted was estimated on the respective dates of grant using the Black-Scholes option pricing model with the weighted average assumptions shown in the following table. 
 
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
 
 
 
 
 
 
 
Number of stock options granted
 
222,828

 
307,176

 
142,908

Weighted average grant date fair value of stock options granted
 
$
6.57

 
$
5.01

 
$
11.18

Weighted average assumptions:
 
 
 
 
 
 
Risk-free interest rate
 
2.0
%
 
1.3
%
 
1.7
%
Expected dividend yield
 
2.5
%
 
3.2
%
 
2.6
%
Expected life, in years
 
4.9

 
4.9

 
7.2

Expected volatility (based on historical volatility)
 
21.4
%
 
25.6
%
 
42.8
%
Computations of net income per share on both basic and diluted bases, including reconciliations of the numerators and denominators The computations of net income per share on both basic and diluted bases, including reconciliations of the numerators and denominators, were as follows: 
($ in thousands)
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
Basic:
 
 

 
 

 
 

Net income for the period
 
$
169,459

 
$
83,765

 
$
93,482

Weighted average number of common shares
during the period (in thousands)
 
41,365

 
41,158

 
41,915

Net income per share - basic
 
$
4.10

 
$
2.04

 
$
2.23

 
 
 
 
 
 
 
Diluted:
 
 

 
 

 
 

Net income for the period
 
$
169,459

 
$
83,765

 
$
93,482

Weighted average number of common shares
during the period (in thousands)
 
41,365

 
41,158

 
41,915

Weighted average number of common equivalent shares to reflect the dilutive effect of common stock equivalent securities (in thousands):
 
 

 
 

 
 

Stock options
 
112

 
100

 
158

CSUs related to deferred compensation for employees
 
25

 
52

 
55

RSUs related to incentive compensation
 
63

 
166

 
297

Total common and common equivalent shares adjusted
to calculate diluted earnings per share (in thousands)
 
41,565

 
41,476

 
42,425

Net income per share - diluted
 
$
4.08

 
$
2.02

 
$
2.20
Components of comprehensive income The components of comprehensive income (loss) were as follows: 
($ in thousands)
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
 
 
 
 
 
 
 
Net income
 
$
169,459

 
$
83,765

 
$
93,482

Other comprehensive income (loss):
 
 
 
 
 
 
Change in net unrealized investment gains and losses
on fixed maturity and equity securities:
 
 
 
 
 
 
Net unrealized investment gains and losses on fixed
maturity and equity securities arising during the period
 
105,475

 
6,144

 
(178,035
)
Less: reclassification adjustment for net gains (losses)
included in income before income tax
 
(4,863
)
 
5,176

 
11,667

Total, before tax
 
110,338

 
968

 
(189,702
)
Income tax expense (benefit)
 
35,933

 
397

 
(67,315
)
Total, net of tax
 
74,405

 
571

 
(122,387
)
Change in net funded status of benefit plan obligations:
 
 

 
 

 
 

Before tax
 
1,461

 
(37
)
 
1,815

Income tax expense (benefit)
 
727

 
(14
)
 
656

Total, net of tax
 
734

 
(23
)
 
1,159

Total comprehensive income (loss)
 
$
244,598

 
$
84,313

 
$
(27,746
)
Accumulated Other Comprehensive Income (Loss) The following table reconciles the components of accumulated other comprehensive income (loss) for the periods indicated.
($ in thousands)
 
Net Unrealized
Investment Gains and
Losses on
Fixed Maturity
and Equity
Securities (1)(2)
 
Defined
Benefit Plans (1)
 
Total (1)(3)
 
 
 
 
 
 
 
Beginning balance, January 1, 2017
 
$
175,738

 
$
(11,817
)
 
$
163,921

Other comprehensive income (loss) before reclassifications
 
71,244

 
734

 
71,978

Amounts reclassified from accumulated
other comprehensive income (loss)
 
3,161

 
—

 
3,161

Reclassification of deferred taxes (3)
 
50,034

 
(2,134
)
 
47,900

Net current period other comprehensive income (loss)
 
124,439

 
(1,400
)
 
123,039

Ending balance, December 31, 2017
 
$
300,177

 
$
(13,217
)
 
$
286,960

 
 
 
 
 
 
 
Beginning balance, January 1, 2016
 
$
175,167

 
$
(11,794
)
 
$
163,373

Other comprehensive income (loss) before reclassifications
 
3,935

 
(23
)
 
3,912

Amounts reclassified from accumulated
other comprehensive income (loss)
 
(3,364
)
 
—

 
(3,364
)
Net current period other comprehensive income (loss)
 
571

 
(23
)
 
548

Ending balance, December 31, 2016
 
$
175,738

 
$
(11,817
)
 
$
163,921

 
 
 
 
 
 
 
Beginning balance, January 1, 2015
 
$
297,554

 
$
(12,953
)
 
$
284,601

Other comprehensive income (loss) before reclassifications
 
(114,803
)
 
1,159

 
(113,644
)
Amounts reclassified from accumulated
other comprehensive income (loss)
 
(7,584
)
 
—

 
(7,584
)
Net current period other comprehensive income (loss)
 
(122,387
)
 
1,159

 
(121,228
)
Ending balance, December 31, 2015
 
$
175,167

 
$
(11,794
)
 
$
163,373

___________________
(1)
All amounts are net of tax.
(2)
The pretax amounts reclassified from accumulated other comprehensive income, $(4,863), $5,176 thousand and $11,667 thousand, are included in net realized investment gains and losses and the related tax expenses, $(1,702), $1,812 thousand and $4,083 thousand, are included in income tax expense in the Consolidated Statements of Operations for the years ended December 31, 2017, 2016 and 2015, respectively.
(3)
For the period ended December 31, 2017, deferred taxes attributable to Net unrealized investment gains and losses on fixed maturity and equity securities and Defined benefit plans were re-measured as a result of the enactment of the Tax Cuts and Jobs Act (Tax Act). ASC 740, Income Taxes, requires that the income tax effect from the deferred tax re-measurement be reflected in the Company’s income tax expense, even if the deferred taxes being re-measured were originally established through Accumulated other comprehensive income (AOCI). The mismatch between deferred taxes established in AOCI at 35% and re-measuring these same deferred taxes at 21% through income tax expense results in stranded deferred taxes in AOCI. On February 14, 2018, the FASB issued accounting guidance that permits recognition of a reclassification adjustment between AOCI and Retained earnings for stranded deferred tax amounts related to the reduced corporate tax rate enacted under the Tax Act. As permitted under its provisions, the Company early adopted the accounting guidance effective for the quarterly period that ended December 31, 2017 and has elected to reclassify the stranded deferred tax amounts. The impact from early adoption resulted in an increase to AOCI and a reduction to Retained earnings of approximately $47,900 thousand; representing the stranded deferred tax liabilities of $50,034 thousand and $(2,134) thousand for Net unrealized investment gains and losses on fixed maturity and equity securities and Defined benefit plans, respectively.