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Retirement And Other Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Summary Of Pension Benefits And Retirement Health Benefits Plans
Summarized information on the Company’s Pension Benefits and Retirement Health Benefits plans (together the “Plans”) for the years ended December 31 is as follows:
 
Pension Benefits
 
Retirement Health Benefits
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Change in projected benefit obligation
 
 
 
 
 
 
 
 
 
 
 
Projected benefit obligation at beginning
   of year
$
(1,064,042
)
 
$
(905,943
)
 
$
(956,172
)
 
$
(96,306
)
 
$
(79,046
)
 
$
(86,237
)
Service cost
(41,989
)
 
(36,609
)
 
(38,580
)
 
(2,429
)
 
(2,188
)
 
(2,863
)
Interest cost
(41,766
)
 
(43,613
)
 
(38,243
)
 
(3,834
)
 
(3,868
)
 
(3,473
)
Actuarial (loss) gain, including
   curtailments and settlements
52,201

 
(127,940
)
 
89,029

 
5,938

 
(13,910
)
 
11,213

Benefits paid
77,002

 
50,063

 
38,023

 
3,121

 
2,706

 
2,314

Projected benefit obligation at end of year
$
(1,018,594
)
 
$
(1,064,042
)
 
$
(905,943
)
 
$
(93,510
)
 
$
(96,306
)
 
$
(79,046
)
Change in plan assets
 
 
 
 
 
 
 
 
 
 
 
Fair value of plan assets at beginning of
   year
$
879,211

 
$
786,750

 
$
704,976

 
$
50,068

 
$
46,971

 
$
45,651

Actual return on plan assets
(5,458
)
 
102,628

 
64,641

 
(291
)
 
5,403

 
3,234

Employer contributions
37,664

 
41,384

 
56,217

 
200

 
400

 
400

Benefits paid (including administrative
   expenses)
(78,731
)
 
(51,551
)
 
(39,084
)
 
(3,121
)
 
(2,706
)
 
(2,314
)
Fair value of plan assets at end of year
$
832,686

 
$
879,211

 
$
786,750

 
$
46,856

 
$
50,068

 
$
46,971

Funded status at end of year
$
(185,908
)
 
$
(184,831
)
 
$
(119,193
)
 
$
(46,654
)
 
$
(46,238
)
 
$
(32,075
)
Summary Of Projected Benefit Obligations And The Accumulated Benefit Obligations
For the years ended December 31, 2015, 2014 and 2013, the projected benefit obligations, the accumulated benefit obligations of Pension Benefits, and fair value of plan assets are as follows:
 
Qualified Pension Benefits
 
Non-Qualified Pension Benefits
 
Total Pension Benefits
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Fair value of plan assets
$
832,686

 
$
879,211

 
$
786,750

 
$
—

 
$
—

 
$
—

 
$
832,686

 
$
879,211

 
$
786,750

Projected benefit obligation
(884,659
)
 
(908,167
)
 
(768,672
)
 
(133,935
)
 
(155,875
)
 
(137,271
)
 
(1,018,594
)
 
(1,064,042
)
 
(905,943
)
Funded status at end of year
$
(51,973
)
 
$
(28,956
)
 
$
18,078

 
$
(133,935
)
 
$
(155,875
)
 
$
(137,271
)
 
$
(185,908
)
 
$
(184,831
)
 
$
(119,193
)
Accumulated benefit obligation
$
764,654

 
$
761,802

 
$
645,431

 
$
113,712

 
$
133,185

 
$
115,286

 
$
878,366

 
$
894,987

 
$
760,717
Amount Recognized In Consolidated Balance Sheets
Amounts recognized in the consolidated balance sheets consist of:
 
Pension Benefits
 
Retirement Health Benefits
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Assets
$
—

 
$
—

 
$
18,078

 
$
—

 
$
—

 
$
—

Liabilities
$
(185,908
)
 
$
(184,831
)
 
$
(137,271
)
 
$
(46,654
)
 
$
(46,238
)
 
$
(32,075
)
Amounts Recognized In Accumulated Other Comprehensive Income
Amounts recognized in accumulated other comprehensive income consist of: 
 
Pension Benefits
 
Retirement Health Benefits
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Net (loss) gain
$
(201,578
)
 
$
(210,859
)
 
$
(147,288
)
 
$
1,987

 
$
(394
)
 
$
11,710

Prior service (cost) credit
(2,339
)
 
(3,272
)
 
(4,119
)
 
4,236

 
5,169

 
6,102

 
$
(203,917
)
 
$
(214,131
)
 
$
(151,407
)
 
$
6,223

 
$
4,775

 
$
17,812
Components Of Net Periodic Benefit Cost
Components of net periodic benefit cost and other amounts recognized in accumulated other comprehensive income for the years ended December 31 were as follows: 
 
Pension Benefits
 
Retirement Health Benefits
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Net periodic benefit cost
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
41,989

 
$
36,609

 
$
38,580

 
$
2,429

 
$
2,188

 
$
2,863

Interest cost
41,766

 
43,613

 
38,243

 
3,834

 
3,868

 
3,473

Expected return on plan assets
(53,868
)
 
(49,552
)
 
(44,222
)
 
(3,267
)
 
(3,081
)
 
(2,998
)
Amortization of prior service cost
787

 
836

 
856

 
(933
)
 
(933
)
 
(933
)
Amortization of net loss (gain)
16,660

 
11,921

 
26,816

 
—

 
(516
)
 
—

Curtailment/settlement charge
1,622

 
871

 
—

 
—

 
—

 
—

Net periodic benefit cost
$
48,956

 
$
44,298

 
$
60,273

 
$
2,063

 
$
1,526

 
$
2,405

Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive income
 
 
 
 
 
 
 
 
 
 
 
Net loss (gain)
$
9,099

 
$
75,909

 
$
(108,387
)
 
$
(2,382
)
 
$
11,588

 
$
(11,449
)
Amortization of prior service cost, and effects of curtailments/settlements
(933
)
 
(847
)
 
(856
)
 
933

 
933

 
933

Amortization of net (loss) gain
(18,381
)
 
(12,338
)
 
(26,816
)
 
—

 
516

 
—

Total recognized in accumulated other comprehensive income
$
(10,215
)
 
$
62,724

 
$
(136,059
)
 
$
(1,449
)
 
$
13,037

 
$
(10,516
)
Total recognized in net periodic benefit cost and other comprehensive income loss
$
38,741

 
$
107,022

 
$
(75,786
)
 
$
614

 
$
14,563

 
$
(8,111
)
Weighted-Average Assumptions Used To Determine Projected Benefit Obligation
Determination of the projected benefit obligation was based on the following weighted-average assumptions for the years ended December 31: 
 
Qualified Pension Benefits
 
Nonqualified Pension Benefits
 
Retirement Health Benefits
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Discount rate
4.55
%
 
4.09
%
 
4.98
%
 
4.25
%
 
3.77
%
 
4.64
%
 
4.53
%
 
4.07
%
 
4.99
%
Weighted-Average Assumptions Used To Determine Net Periodic Benefit Cost
Determination of the net periodic benefit cost was based on the following weighted-average assumptions for the years ended December 31: 
 
Qualified Pension Benefits
 
Nonqualified Pension Benefits
 
Retirement Health Benefits
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Discount rate
4.09
%
 
4.98
%
 
4.12
%
 
3.77
%
 
4.64
%
 
3.71
%
 
4.07
%
 
4.99
%
 
4.12
%
Expected long-term return on plan assets
6.75
%
 
6.75
%
 
6.75
%
 
—

 
—

 
—

 
6.75
%
 
6.75
%
 
6.75
%

*
Assumed rates of compensation increases are also used to determine net periodic benefit cost. Assumed rates varied by age and ranged from 3.25% to 9.30% for the Pension Benefits for the years ended December 31, 2015, 2014 and 2013.
Summary Of Health Care Cost Trend Rates
The assumed health care cost trend rates used in measuring the accumulated postretirement benefit obligation and net periodic benefit cost were as follows: 
 
Retirement Health Benefits
 
2015
 
2014
 
2013
Health care cost trend rate assumed for next year:
 
 
 
 
 
Pre-65 Non-reimbursement Plan
9.3
%
 
8.1
%
 
8.7
%
Post-65 Non-reimbursement Plan (Medical)
5.7
%
 
8.0
%
 
8.5
%
Post-65 Non-reimbursement Plan (Rx)
10.2
%
 
8.0
%
 
8.5
%
Pre-65 Reimbursement Plan
8.1
%
 
8.1
%
 
8.7
%
Post-65 Reimbursement Plan
8.1
%
 
8.1
%
 
8.7
%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)
4.5
%
 
4.5
%
 
4.5
%
Year that the rate reaches the ultimate trend rate
 
 
 
 
 
Pre-65 Non-reimbursement Plan
2030
 
2028
 
2028
Post-65 Non-reimbursement Plan (Medical & Rx)
2030
 
2028
 
2028
Pre-65 Reimbursement Plan
2030
 
2028
 
2028
Post-65 Reimbursement Plan
2030
 
2028
 
2028
Effect Of One Percent Change In Assumed Health Care Cost
A one-percentage point change in assumed health care cost trend rates would have the following effects:
 
Retirement Health Benefits
 
2015
 
2014
 
2013
One percentage point increase in health care cost trend rate
 
 
 
 
 
Effect on total of service and interest cost components
$
38

 
$
39

 
$
43

Effect on postretirement benefit obligation
622

 
646

 
601

One percentage point decrease in health care cost trend rate
 
 
 
 
 
Effect on total of service and interest cost components
$
(59
)
 
$
(60
)
 
$
(66
)
Effect on postretirement benefit obligation
(908
)
 
(933
)
 
(884
)
Allocation Of Plan Assets, Based On The Fair Value Of Assets Held And Target Allocation
As a result of this review, the Investment Committee adopted the current target asset allocation. The allocation is consistent with 2014.
 
The Plans’
Asset Allocation Percentages
Financial Assets (1)
Low
 
Target (2)
 
High
Equity securities:
 
 
 
 
 
Common stock- U.S. listed small cap
5.0
%
 
7.5
%
 
10.0
%
Mutual fund- U.S. listed large cap
10.0
%
 
15.0
%
 
20.0
%
Common/collective trust- foreign listed
5.0
%
 
7.5
%
 
10.0
%
Fixed maturity securities:
 
 
 
 
 
U.S. & foreign government and government agencies and authorities
6.5
%
 
9.0
%
 
11.5
%
Corporate- U.S. & foreign investment grade
31.0
%
 
33.5
%
 
36.0
%
Corporate- U.S. & foreign high yield
5.0
%
 
7.5
%
 
10.0
%
Alternative investment fund:
 
 
 
 
 
Multi-strategy hedge fund
5.5
%
 
8.0
%
 
10.5
%
Commingled real estate fund
3.5
%
 
6.0
%
 
8.5
%
Private equity fund
—
%
 
6.0
%
 
8.5
%

(1)
The Plans’ long-term asset allocation targets are 30% equity, 50% fixed income and 20% investment funds. The Company invests certain plan assets in investment funds, examples of which include real estate investment funds and private equity funds. Amounts allocated for these investments are included in the alternative investment funds caption of the asset allocation at December 31, 2015, provided in the section above.
(2)
It is understood that these guidelines are targets and that deviations may occur periodically as a result of cash flows, market impact or short-term decisions implemented by either the Investment Committee or their investment managers.
Schedule Of Fair Value Hierarchy For Qualified Pension And Other Post Retirement Benefit Plan Assets
The fair value hierarchy for the Company’s qualified pension plan and other post retirement benefit plan assets at December 31, 2015 by asset category, is as follows:
 
Qualified Pension Benefits
December 31, 2015
Financial Assets
Total
 
Level 1
 
Level 2
 
Level 3
Cash and cash equivalents:
 
 
 
 
 
 
 
Short-term investment funds
$
30,628

 
$
—

 
$
30,628

 
$
—

Equity securities:
 
 
 
 
 
 
 
Common stock- U.S. listed small cap
66,948

 
66,948

 
—

 
—

Preferred stock
4,420

 
4,420

 
—

 
—

Mutual funds- U.S. listed large cap
141,580

 
141,580

 
—

 
—

Common/collective trust- foreign listed
57,948

 
—

 
57,948

 
—

Fixed maturity securities:
 
 
 
 
 
 
 
U.S. & foreign government and government
   agencies and authorities
126,531

 
—

 
126,531

 
—

Corporate- U.S. & foreign investment grade
221,766

 
—

 
221,766

 
—

Corporate- U.S. & foreign high yield
57,238

 
—

 
57,238

 
—

Investment fund:
 
 
 
 
 
 
 
Multi-strategy hedge fund
61,761

 
—

 
—

 
61,761

Commingled real estate fund
49,643

 
—

 
49,643

 
—

Private equity fund
6,210

 
—

 
—

 
6,210

Derivatives:
 
 
 
 
 
 
 
Interest rate swap
14,024

 
—

 
14,024

 
—

Total financial assets
$
838,697

(1) 
$
212,948

 
$
557,778

 
$
67,971

 

(1)
The difference between the fair value of plan assets above and the amount used in determining the funded status is due to interest receivable which is not required to be included in the fair value hierarchy.
Retirement Health Benefits
December 31, 2015
Financial Assets
Total
 
Level 1
 
Level 2
 
Level 3
Cash and cash equivalents:
 
 
 
 
 
 
 
Short-term investment funds
$
1,723

 
$
—

 
$
1,723

 
$
—

Equity securities:
 
 
 
 
 
 
 
Common stock- U.S. listed small cap
3,767

 
3,767

 
—

 
—

Preferred stock
249

 
249

 
—

 
—

Mutual funds- U.S. listed large cap
7,967

 
7,967

 
—

 
—

Common/collective trust- foreign listed
3,261

 
—

 
3,261

 
—

Fixed maturity securities:
 
 
 
 
 
 
 
U.S. & foreign government and government
   agencies and authorities
7,120

 
—

 
7,120

 
—

Corporate- U.S. & foreign investment grade
12,479

 
—

 
12,479

 
—

Corporate- U.S. & foreign high yield
3,221

 
—

 
3,221

 
—

Investment fund:
 
 
 
 
 
 
 
Multi-strategy hedge fund
3,475

 
—

 
—

 
3,475

Commingled real estate fund
2,794

 
—

 
2,794

 
—

Private equity fund
350

 
—

 
—

 
350

Derivatives:
 
 
 
 
 
 
 
Interest rate swap
789

 
—

 
789

 
—

Total financial assets
$
47,195

(1) 
$
11,983

 
$
31,387

 
$
3,825

 

(1)
The difference between the fair value of plan assets above and the amount used in determining the funded status is due to interest receivable which is not required to be included in the fair value hierarchy.

The fair value hierarchy for the Company’s qualified pension plan and other post retirement benefit plan assets at December 31, 2014 by asset category, is as follows: 
Qualified Pension Benefits
December 31, 2014
Financial Assets
Total
 
Level 1
 
Level 2
 
Level 3
Cash and cash equivalents:
 
 
 
 
 
 
 
Short-term investment funds
$
41,165

 
$
—

 
$
41,165

 
$
—

Equity securities:
 
 
 
 
 
 
 
Common stock- U.S. listed small cap
63,761

 
63,761

 
—

 
—

Preferred stock
4,209

 
4,209

 
—

 
—

Mutual funds- U.S. listed large cap
191,240

 
191,240

 
—

 
—

Common/collective trust- foreign listed
59,249

 
—

 
59,249

 
—

Fixed maturity securities:
 
 
 
 
 
 
 
U.S. & foreign government and government
   agencies and authorities
121,694

 
—

 
121,694

 
—

Corporate- U.S. & foreign investment grade
226,078

 
—

 
226,078

 
—

Corporate- U.S. & foreign high yield
55,759

 
—

 
55,759

 
—

Investment fund:
 
 
 
 
 
 
 
Multi-strategy hedge fund
63,132

 
—

 
—

 
63,132

Commingled real estate fund
43,471

 
—

 
43,471

 
—

Private equity fund
4,614

 
—

 
—

 
4,614

Derivatives:
 
 
 
 
 
 
 
Interest rate swap
14,242

 
—

 
14,242

 
—

Total financial assets
$
888,614

(1) 
$
259,210

 
$
561,658

 
$
67,746


(1)
The difference between the fair value of plan assets above and the amount used in determining the funded status is due to interest receivable which is not required to be included in the fair value hierarchy.
Retirement Health Benefits
December 31, 2014
Financial Assets
Total
 
Level 1
 
Level 2
 
Level 3
Cash and cash equivalents:
 
 
 
 
 
 
 
Short-term investment funds
$
2,344

 
$
—

 
$
2,344

 
$
—

Equity securities:
 
 
 
 
 
 
 
Common stock- U.S. listed small cap
3,631

 
3,631

 
—

 
—

Preferred stock
240

 
240

 
—

 
—

Mutual funds- U.S. listed large cap
10,890

 
10,890

 
—

 
—

Common/collective trust- foreign listed
3,374

 
—

 
3,374

 
—

Fixed maturity securities:
 
 
 
 
 
 
 
U.S. & foreign government and government
   agencies and authorities
6,930

 
—

 
6,930

 
—

Corporate- U.S. & foreign investment grade
12,874

 
—

 
12,874

 
—

Corporate- U.S. & foreign high yield
3,175

 
—

 
3,175

 
—

Investment fund:
 
 
 
 
 
 
 
Multi-strategy hedge fund
3,595

 
—

 
—

 
3,595

Commingled real estate fund
2,476

 
—

 
2,476

 
—

Private equity fund
263

 
—

 
—

 
263

Derivatives:
 
 
 
 
 
 
 
Interest rate swap
811

 
—

 
811

 
—

Total financial assets
$
50,603

(1) 
$
14,761

 
$
31,984

 
$
3,858

 

(1)
The difference between the fair value of plan assets above and the amount used in determining the funded status is due to interest receivable which is not required to be included in the fair value hierarchy.
Summary Of Change In Fair Value Financial Asset
The following table for the Company’s qualified pension plan and retirement health benefit plan summarizes the change in fair value associated with the MIMSF and Private Equity Partners XI Limited Partnership, the only Level 3 financial assets.
 
Pension
Benefit
 
Retirement
Health
Benefit
Beginning balance at December 31, 2014
$
67,746

 
$
3,858

Purchases
1,403

 
79

Refund of capital
(86
)
 
(5
)
Actual return on plan assets and plan expenses still held at the reporting date
(1,092
)
 
(107
)
Ending balance at December 31, 2015
$
67,971

 
$
3,825
Estimated Future Benefit Payments From The Plans
The following pension benefits, which reflect expected future service, as appropriate, are expected to be paid:
 
Pension
Benefits
 
Retirement
Health
Benefits
2016
$
60,555

 
$
4,000

2017
58,245

 
4,361

2018
57,881

 
4,708

2019
60,056

 
5,066

2020
75,144

 
5,446

2021 - 2025
394,654

 
32,844

Total
$
706,535

 
$
56,425