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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Schedule of Defined Benefit Plans Disclosures
A summary of plan assets, projected benefit obligation and funded status of the plans are as follows for the year ended December 31, 2014 and the year ended December 31, 2013 (in thousands): 
 
Qualified Pension Plans
 
 
 
 
 
Year Ended December 31, 2014
 
Year Ended December 31, 2013
Fair value of plan assets:
 
 
 
Beginning fair value of plan assets
$
175,242

 
$
166,304

Actual return on plan assets
7,553

 
18,883

Plan settlements
(2,935
)
 
(7,931
)
Employer contributions
30,000

 
21,800

Benefits paid
(14,450
)
 
(23,814
)
Ending fair value of plan assets
195,410

 
175,242

Projected benefit obligation:
 
 
 
Beginning projected benefit obligation
$
328,776

 
$
369,841

Service cost
14,760

 
18,543

Interest cost
15,367

 
14,934

Plan settlements
(2,935
)
 
(7,931
)
Benefits paid
(14,450
)
 
(23,814
)
Actuarial loss (gain)
66,698

 
(42,797
)
Ending projected benefit obligation
408,216

 
328,776

Funded status
$
(212,806
)
 
$
(153,534
)
 
 
 
 
Accumulated benefit obligation
$
366,649

 
$
290,910

 
 
 
 
Amounts recognized in the consolidated balance sheet:
 
 
 
Long-term liabilities
$
(212,806
)
 
$
(153,534
)
Net amount recognized in the consolidated balance sheet
$
(212,806
)
 
$
(153,534
)
 
 
 
 
Amounts recognized in accumulated other comprehensive loss:
 
 
 
Net actuarial loss
$
(130,294
)
 
$
(60,349
)
Net amount recognized in accumulated other comprehensive loss
$
(130,294
)
 
$
(60,349
)
 
Post-retirement Healthcare Plans
 
 
 
 
 
Year Ended December 31, 2014
 
Year Ended December 31, 2013
Fair value of plan assets:
 
 
 
Beginning fair value of plan assets
$
—

 
$
—

Employer contributions
6,097

 
3,704

Benefits paid
(6,097
)
 
(3,704
)
Ending fair value of plan assets
—

 
—

Projected benefit obligation:
 
 
 
Beginning projected benefit obligation
$
590,435

 
$
621,443

Service cost
24,969

 
26,712

Interest cost
29,908

 
24,555

Plan amendment (a)
(46,277
)
 
—

Benefits paid
(6,097
)
 
(3,704
)
Actuarial loss (gain)
148,434

 
(78,571
)
Ending projected benefit obligation
741,372

 
590,435

Funded status
$
(741,372
)
 
$
(590,435
)
 
 
 
 
Amounts recognized in the consolidated balance sheet:
 
 
 
Current liabilities
$
(6,021
)
 
$
(5,701
)
Long-term liabilities
(735,351
)
 
(584,734
)
Net amount recognized in the consolidated balance sheet
$
(741,372
)
 
$
(590,435
)
 
 
 
 
Amounts recognized in accumulated other comprehensive loss:
 
 
 
Prior service credit
$
45,329

 
$
—

Net actuarial loss
$
(253,740
)
 
$
(111,960
)
Net amount recognized in accumulated other comprehensive loss
$
(208,411
)
 
$
(111,960
)

(a) In the fourth quarter of 2014, the Company amended its OPEB Plan to permit the former represented employees currently receiving post-retirement healthcare benefits to participate in that plan. Effective January 1, 2015, the former represented employees were transferred from their current plan to the OPEB Plan. The healthcare plan options available in the OPEB Plan contain higher deductibles, co-pays and co-insurance requirements than the healthcare plan options in the post-retirement healthcare plan for former represented employees. Accordingly, the Company recognized a gain as a result of the plan amendment, which will be accounted for as a prior service credit.
Schedule of Allocation of Plan Assets
The asset allocation at December 31, 2014 for the Company's qualified pension plan assets was as follows: 
 
Non-Represented
Employees Plan
 
Represented
Employees Plan
 
Total Qualified
Pension Plans
 
 
 
 
 
 
Cash and cash equivalents (a)
0.6
%
 
0.4
%
 
0.4
%
Equity securities (b)
31.3
%
 
74.9
%
 
68.3
%
Fixed income securities
68.1
%
 
24.7
%
 
31.3
%
Plan asset portfolio allocation at December 31, 2014
100.0
%
 
100.0
%
 
100.0
%
 
(a)
Cash and cash equivalents at December 31, 2014 include amounts pending settlement from the purchase or sale of equity or fixed income securities.
(b)
Equity securities at December 31, 2014 include amounts held in hedged equity funds which primarily invest using a "fund of funds" strategy in multiple other equity funds.
The fair values for the qualified pension plan assets by asset category at December 31, 2014 are as follows (in thousands): 
 
Total
 
Level 1
 
Level 2
 
Level 3
 
 
 
 
 
 
 
 
Cash and cash equivalents
$
848

 
$
848

 
$
—

 
$
—

Equity securities (a)
133,446

 
79,896

 
53,199

 
351

Fixed income securities
61,116

 
26,803

 
34,313

 
—

Fair value of plan assets at December 31, 2014
$
195,410

 
$
107,547

 
$
87,512

 
$
351

(a)
All Level 3 equity securities are amounts held in hedged equity funds.
The fair values for the qualified pension plan assets by asset category at December 31, 2013 were as follows (in thousands): 
 
Total
 
Level 1
 
Level 2
 
Level 3
 
 
 
 
 
 
 
 
Cash and cash equivalents
$
1,677

 
$
1,677

 
$
—

 
$
—

Equity securities (a)
107,683

 
69,381

 
26,591

 
11,711

Fixed income securities
65,882

 
28,942

 
36,940

 
—

Fair value of plan assets at December 31, 2013
$
175,242

 
$
100,000

 
$
63,531

 
$
11,711

(a)
All Level 3 equity securities are amounts held in hedged equity funds.
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets
A reconciliation of the beginning and ending balance of plan assets that are measured at fair value using significant unobservable inputs (Level 3) for the year ended December 31, 2013 and the year ended December 31, 2014 is as follows (in thousands): 
 
Hedged Equity Funds
Balance at December 31, 2012
$
11,869

Actual gain on plan assets held
2,083

Purchases, sales and settlements, net
(2,241
)
Balance at December 31, 2013
$
11,711

Actual gain (loss) on plan assets held
145

Purchases, sales and settlements, net
(11,505
)
Balance at December 31, 2014
$
351
Schedule of Net Periodic Benefit Costs of Pension and Post-Retirement Healthcare
Components of the net periodic benefit cost related to the Company's qualified pension plans and post-retirement healthcare plans for the years ended December 31, 2014, 2013 and 2012 are as follows (in thousands):
 
 
Qualified Pension Plans
 
 
 
 
 
 
 
 
 
 
 
 
 

 
 
Year Ended
December 31, 2014

Year Ended
December 31, 2013
 
Year Ended
December 31, 2012
 
 
 
 
 
 
 
 
 
Service cost
$
14,760

 
$
18,543

 
$
15,489

 
Interest cost
15,367

 
14,934

 
14,565

 
Expected return on plan assets
(13,525
)
 
(12,462
)
 
(13,268
)
 
Amortization of actuarial loss
2,054

 
5,585

 
2,213

 
Plan settlement
671

 
1,683

 
445

 
Net periodic benefit cost
$
19,327


$
28,283

 
$
19,444

 
 
 
Post-retirement Healthcare Plans
 
 
 
 
 
 
 
 
 
 
 
 


 
 
Year Ended
December 31, 2014

Year Ended
December 31, 2013

Year Ended
December 31, 2012
 
 
 
 
 
 

 
 
Service cost
$
24,969

 
$
26,712


$
25,423

 
Interest cost
29,908

 
24,555


23,958

 
Expected return on plan assets
—

 
—


(33
)
 
Amortization of prior service credit
(948
)
 
—


—

 
Amortization of actuarial loss
6,654

 
7,398


6,194

 
Net periodic benefit cost
$
60,583

 
$
58,665


$
55,542
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)
Other pre-tax changes in plan assets and benefit obligations recognized in other comprehensive loss are as follows for the years ended December 31, 2014, 2013 and 2012, respectively, (in thousands): 
 
 
Qualified Pension Plans
 
 
 
 
 
 
 
 
 
 
 
 
 

 
 
Year Ended
December 31, 2014
 
Year Ended
December 31, 2013
 
Year Ended
December 31, 2012
 
 
Amounts recognized in other comprehensive loss:
 
 
 
 
 
 
Net (gain) loss arising during the period
$
72,670

 
$
(49,218
)
 
$
48,632

 
Amortization or settlement recognition of net loss
(2,725
)
 
(7,268
)
 
(2,658
)
 
Total amount recognized in other comprehensive loss
$
69,945

 
$
(56,486
)
 
$
45,974

 
 
 
 
 
 
 
 
Estimated amounts that will be amortized from accumulated other comprehensive loss in the next fiscal year:
 
 
 
 
 
 
Net actuarial loss
(7,421
)
 
(2,156
)
 
(4,870
)
 
Total amount estimated to be amortized from accumulated other comprehensive loss in the next fiscal year
$
(7,421
)
 
$
(2,156
)
 
$
(4,870
)
 
 
Post-retirement Healthcare Plans
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Year Ended
December 31, 2014
 
Year Ended
December 31, 2013
 
Year Ended
December 31, 2012
 
 
Amounts recognized in other comprehensive loss:
 
 
 
 
 
 
Prior service credit
(46,277
)
 
—

 
—

 
Net (gain) loss arising during the period
148,434

 
(78,571
)
 
42,405

 
Amortization of prior service credit
948

 
—

 
—

 
Amortization or settlement recognition of net loss
(6,654
)
 
(7,398
)
 
(6,194
)
 
Total amount recognized in other comprehensive loss
$
96,451

 
$
(85,969
)
 
$
36,211

 
 
 
 
 
 
 
 
Estimated amounts that will be amortized from accumulated other comprehensive loss in the next fiscal year:
 
 
 
 
 
 
Prior service credit
5,782

 
—

 
—

 
Net actuarial loss
(14,389
)
 
(3,694
)
 
(8,941
)
 
Total amount estimated to be amortized from accumulated other comprehensive loss in the next fiscal year
$
(8,607
)
 
$
(3,694
)
 
$
(8,941
)
Schedule of Assumptions Used
The weighted average assumptions used in determining projected benefit obligations are as follows:
 
 
 
 
 
 
December 31, 2014
 
December 31, 2013
Qualified Pension Plans:
 
 
 
Discount rate
4.04
%
 
4.92
%
Rate of compensation increase (a)
3.00
%
 
3.00
%
Post-retirement Healthcare Plans:
 
 
 
Discount rate
4.14
%
 
4.98
%
Rate of compensation increase (a)
4.00
%
 
4.00
%
 
(a)
The rate of future increases in compensation assumption only applies to the plans for represented employees as plans for non-represented employees are frozen.
Net Periodic Benefit Cost Assumptions. The weighted average assumptions used in determining net periodic cost are as follows:
 
 
Years Ended December 31,
 
 
2014
 
2013
 
2012
Qualified Pension Plans:
 
 
 
 
 
Discount rate
4.92
%
 
4.08
%
 
4.63
%
Expected return on plan assets (a)
7.66
%
 
7.54
%
 
7.52
%
Rate of compensation increase (b)
3.00
%
 
3.00
%
 
3.00
%
Post-retirement Healthcare Plans:
 
 
 
 
 
Discount rate
4.98
%
 
4.20
%
 
4.66
%
Rate of compensation increase (b)
4.00
%
 
4.00
%
 
4.00
%
Healthcare cost trend rate assumed for participants under 65 (a)
7.90
%
 
8.10
%
 
8.40
%
Healthcare cost trend rate assumed for participants over 65 (a)
7.90
%
 
8.10
%
 
8.40
%
Rate that the cost trend rates ultimately declines to
4.50
%
 
4.50
%
 
4.50
%
Year that the rates reach the terminal rate
2030

 
2030

 
2030

 
(a)
The expected return on plan assets is the long-term rate-of-return the Company expects to earn on the plan assets. In developing the expected return on plan asset assumption, the Company evaluated historical investment performance, the plans' asset allocation strategies and return forecasts for each asset class and input from its advisors. Projected returns by such advisors were based on broad equity and fixed income indices. The expected return on plan assets is reviewed annually in conjunction with other plan assumptions and, if considered necessary, revised to reflect changes in the financial markets and the investment strategy. The investment strategy and target allocations of the qualified pension plans previously disclosed in "—Plan Assets, Obligations and Funded Status—Qualified Pension Plan Assets" herein were utilized.
(b)
The rate of future increases in compensation assumption only applies to the plans for represented employees as plans for non-represented employees are frozen.
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rate
Post-retirement Healthcare Plan Sensitivity. A 1% change in the medical trend rate assumed for post-retirement healthcare benefits at December 31, 2014 would have the following effects (in thousands): 
 
Increase (Decrease)
1% increase in the medical trend rate:
 
Effect on total service cost and interest cost components
$
14,152

Effect on benefit obligation
$
182,080

1% decrease in the medical trend rate:
 
Effect on total service cost and interest cost components
$
(10,719
)
Effect on benefit obligation
$
(138,046
)
Schedule of Impact of Medicare Drug Act of 2003 Subsidy
The impact of the Medicare Drug Act of 2003 subsidy on the post-retirement healthcare benefits at December 31, 2014 is as follows (in thousands): 
 
Increase (Decrease)
 
 
Change in projected benefit obligation
$
(35,554
)
 
 
Change in each component of net periodic cost:
 
Service cost
$
(1,356
)
Interest cost
(1,641
)
Amortization of loss
(2,149
)
Total change in net periodic cost
$
(5,146
)
Schedule of Expected Benefit Payments
Estimated future employer contributions, benefit payments and Medicare prescription drug subsidies expected to offset the future post-retirement healthcare benefit payments as of December 31, 2014 are as follows (in thousands): 
 
Qualified
Pension Plans
 
Post-retirement
Healthcare Plans
 
 
 
 
Expected employer contributions for fiscal year 2015
$
16,190

 
$
6,021

Expected benefit payments for fiscal years:
 
 
 
2015
$
6,311

 
$
6,021

2016
7,165

 
7,506

2017
8,244

 
9,199

2018
10,447

 
11,166

2019
11,347

 
13,439

2020-2024
81,870

 
109,814

Expected subsidy for fiscal years:
 
 
 
2015
 
 
$
12

2016
 
 
28

2017
 
 
48

2018
 
 
76

2019
 
 
114

2020-2024
 
 
1,610