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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2015
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 (in thousands): 
 
Qualified Pension Plans
 
 
 
Six Months Ended June 30, 2015
Value of plan assets:
 
Beginning fair value of plan assets
$
195,410

Expected return on plan assets
10,757

Plan settlements
(1,179
)
Employer contributions
4,800

Benefits paid
(6,347
)
Ending value of plan assets
203,441

Projected benefit obligation:
 
Beginning projected benefit obligation
$
408,216

Service cost
5,169

Interest cost
7,444

Plan amendment
(40,049
)
Plan settlements
(569
)
Benefits paid
(6,347
)
Actuarial gain
(4,768
)
Ending projected benefit obligation
369,096

Funded status
$
(165,655
)
 
 
Accumulated benefit obligation
$
369,096

Amounts recognized in the consolidated balance sheet:
 
Long-term liabilities
$
165,655

Net amount recognized in the consolidated balance sheet
$
165,655

 
 
Amounts recognized in accumulated other comprehensive income/(loss):
 
Prior service credit
$
38,842

Net actuarial loss
(118,251
)
Plan settlements
(2
)
Net amount recognized in accumulated other comprehensive income/(loss)
$
(79,411
)
 
Other Post-employment Benefit Plans
 
 
 
Six Months Ended June 30, 2015
Value of plan assets:
 
Beginning fair value of plan assets
$
—

Employer contributions
2,635

Benefits paid
(2,635
)
Ending value of plan assets
—

Projected benefit obligation:
 
Beginning projected benefit obligation
$
741,372

Service cost
4,417

Interest cost
5,678

Plan amendments
(609,619
)
Plan curtailment
(5,409
)
Benefits paid
(2,635
)
Actuarial gain
(27,075
)
Ending projected benefit obligation
106,729

Funded status
$
(106,729
)
 
 
Amounts recognized in the consolidated balance sheet:
 
Current liabilities
$
(5,166
)
Long-term liabilities
(101,563
)
Net amount recognized in the consolidated balance sheet
$
(106,729
)
 
 
Amounts recognized in accumulated other comprehensive income/(loss):
 
Net prior service credit
$
529,422

Net actuarial loss
(173,382
)
Net amount recognized in accumulated other comprehensive income/(loss)
$
356,040
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 other post-employment benefit plans for the three and six months ended June 30, 2015 and 2014 are as follows (in thousands):
 
Three Months Ended June 30, 2015
 
Three Months Ended June 30, 2014
 
Qualified
Pension Plans
 
Other Post-
employment Benefit Plans
 
Qualified
Pension Plans
 
Other Post-
employment Benefit Plans
Service cost
$
1,823

 
$
62

 
$
4,075

 
$
6,344

Interest cost
3,633

 
1,013

 
3,963

 
7,311

Expected return on plan assets
(3,658
)
 
—

 
(3,406
)
 
—

Amortization of actuarial loss
1,886

 
32,838

 
539

 
924

Amortization of prior service cost
(863
)
 
(89,550
)
 
—

 
—

Plan Settlement
607

 
—

 
—

 
—

Net periodic benefit cost
3,428

 
(55,637
)
 
5,171

 
14,579

Less capitalized portion
(251
)
 
—

 
(417
)
 
(1,176
)
Other post-employment benefit and pension expense
$
3,177

 
$
(55,637
)
 
$
4,754

 
$
13,403


 
Six Months Ended June 30, 2015
 
Six Months Ended June 30, 2014
 
Qualified
Pension Plans
 
Other Post-
employment Benefit Plans
 
Qualified
Pension Plans
 
Other Post-
employment Benefit Plans
Service cost
$
5,169

 
$
4,417

 
$
8,150

 
$
12,689

Interest cost
7,444

 
5,678

 
7,926

 
14,622

Expected return on plan assets
(7,223
)
 
—

 
(6,811
)
 
—

Amortization of actuarial loss
3,741

 
47,874

 
1,078

 
1,847

Amortization of prior service cost
(1,207
)
 
(125,526
)
 
—

 
—

Plan settlement
607

 
—

 
—

 
—

Net periodic benefit cost
8,531

 
(67,557
)
 
10,343

 
29,158

Less capitalized portion
(332
)
 
—

 
(790
)
 
(2,226
)
Other post-employment benefit and pension expense
$
8,199

 
$
(67,557
)
 
$
9,553

 
$
26,932
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)
Other Comprehensive Income/(Loss). Other pre-tax changes in plan assets and benefit obligations recognized in other comprehensive income/(loss) are as follows (in thousands): 
 
 
Qualified Pension Plans
 
 
 
 
 
 
Three Months Ended June 30, 2015
Six Months Ended June 30, 2015
 
 
Amounts recognized in other comprehensive income/(loss):
 
 
 
Prior service credit
$
—

$
40,049

 
Net gain arising during the period
—

8,302

 
Amortization of prior service credit
(863
)
(1,207
)
 
Amortization of net actuarial loss
1,886

3,741

 
Plan settlement
(2
)
(2
)
 
Total amount recognized in other comprehensive income/(loss)
$
1,021

$
50,883

 
 
 
 
 
Estimated amounts that will be amortized from accumulated other comprehensive income/(loss) in the next six months:
 
 
 
Prior service credit
$
(1,726
)
 
 
Net actuarial loss
3,786

 
 
Total amount estimated to be amortized from accumulated other comprehensive income/(loss) in the next six months
$
2,060

 

 
Other Post-employment Benefit Plans
 
 
 
 
Three Months Ended June 30, 2015
Six Months Ended June 30, 2015
Amounts recognized in other comprehensive income/(loss):
 
 
Prior service credit
$
—

619,454

Prior service cost
—

(9,835
)
Plan curtailment
—

5,409

Net gain arising during the period
—

27,075

Amortization of prior service credit
(89,550
)
(125,526
)
Amortization of net actuarial loss
32,838

47,874

Total amount recognized in other comprehensive income
$
(56,712
)
$
564,451

 
 
 
Estimated amounts that will be amortized from accumulated other comprehensive income/(loss) in the next six months:
 
 
Net prior service credit
$
(179,100
)
 
Net actuarial loss
65,550

 
Total amount estimated to be amortized from accumulated other comprehensive income/(loss) in the next six months
$
(113,550
)
 
Schedule of Assumptions Used
Projected Benefit Obligation Assumptions. The weighted average assumptions used in determining projected benefit obligations for these plans at their respective measurement dates are as follows:
 
 
June 30, 2015
Qualified Pension Plans:
 
Discount rate
4.00
%
Other Post-employment Benefit Plans:
 
Discount rate
3.77
%
 
Net Periodic Benefit Cost Assumptions. The weighted average assumptions used in determining net periodic benefit cost are as follows:
 
 
Three Months Ended June 30,
 
2015
 
2014
Qualified Pension Plans:
 
 
 
Discount rate
4.10
%
 
4.92
%
Expected return on plan assets (a)
7.28
%
 
7.66
%
Other Post-employment Benefit Plans:
 
 
 
Discount rate
3.29
%
 
4.98
%
 
(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.
Schedule of Expected Benefit Payments
Estimated future employer contributions, benefit payments and Medicare prescription drug subsidies expected to offset the future other post-employment benefit payments as of June 30, 2015 are as follows (in thousands): 
 
Qualified
Pension Plans
 
Other Post-employment Benefit Plans
Expected employer contributions for fiscal year 2015
$
15,000

 
$
5,166

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

 
$
5,166

2016
7,165

 
5,777

2017
8,244

 
6,270

2018
10,447

 
6,614

2019
11,347

 
6,884

2020-2024
81,870

 
33,371