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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Schedule of Amounts Recognized for All of the Entity's Pension and Postretirement Benefit Plans
The amounts recognized for all of the Company's pension and postretirement benefit plans are as follows (in thousands):

 
Pension Benefits
 
Other Postretirement Benefits
 
December 31, 
 2014
 
December 31, 
 2013
 
December 31, 
 2014
 
December 31, 
 2013
Accumulated benefit obligation
$
290,524

 
$
247,874

 
$
598,385

 
$
600,748

Change in projected benefit obligation:
 
 
 
 
 
 
 
Benefit obligation at beginning of year
$
265,650

 
$
295,944

 
$
600,748

 
$
662,464

Service cost
6,804

 
7,062

 
7,776

 
9,943

Interest cost
13,296

 
12,280

 
30,903

 
28,791

Actuarial (gain) loss
59,433

 
(37,873
)
 
64,426

 
(74,146
)
Benefits paid
(28,083
)
 
(11,763
)
 
(28,924
)
 
(26,304
)
Plan amendments
4,531

 
—

 
(76,544
)
 
—

Plan settlements
(5,162
)
 
—

 
—

 
—

Benefit obligation at end of year
$
316,469

 
$
265,650

 
$
598,385

 
$
600,748

Change in plan assets:
 
 
 
 
 
 
 
Fair value of plan assets at beginning of year
$
257,765

 
$
232,960

 
$
—

 
$
—

Actual return on plan assets
14,138

 
35,788

 
—

 
—

Employer contributions
771

 
780

 
28,924

 
26,304

Benefits paid
(28,083
)
 
(11,763
)
 
(28,924
)
 
(26,304
)
Fair value of plan assets at end of year
$
244,591

 
$
257,765

 
$
—

 
$
—

Unfunded status of plan
$
(71,878
)
 
$
(7,885
)
 
$
(598,385
)
 
$
(600,748
)
Amounts recognized in balance sheet, pre-tax:
 
 
 
 
 
 
 
Other long-term assets
$
—

 
$
1,260

 
$
—

 
$
—

Pension and other postretirement benefits obligation
 
 
 
 
 
 
 
Current
(3,292
)
 
(7,089
)
 
(25,740
)
 
(30,036
)
Long-term
(68,586
)
 
(2,056
)
 
(572,645
)
 
(570,712
)
Net amount recognized
$
(71,878
)
 
$
(7,885
)
 
$
(598,385
)
 
$
(600,748
)
Amounts recognized in accumulated other comprehensive income (loss), pre-tax
 
 
 
 
 
 
 
Prior service cost (credit)
$
5,279

 
$
994

 
$
(70,130
)
 
$
7,641

Net actuarial loss
107,884

 
48,331

 
287,550

 
238,693

Net amount recognized
$
113,163

 
$
49,325

 
$
217,420

 
$
246,334
Components of Net Periodic Benefit Cost
The components of net periodic benefit cost are as follows (in thousands):

 
Pension Benefits
 
Other Postretirement Benefits
 
For the years ended December 31,
 
For the years ended December 31,
 
2014
 
2013
 
2012
 
2014
 
2013
 
2012
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
6,804

 
$
7,062

 
$
5,991

 
$
7,776

 
$
9,943

 
$
8,072

Interest cost
13,296

 
12,280

 
12,517

 
30,903

 
28,791

 
29,010

Expected return on plan assets
(18,213
)
 
(16,941
)
 
(16,125
)
 
—

 
—

 
—

Amortization of prior service cost
246

 
263

 
256

 
1,227

 
1,230

 
1,045

Amortization of net actuarial loss
2,292

 
9,609

 
9,377

 
15,570

 
18,936

 
14,725

Settlement loss
1,663

 
—

 
—

 
—

 
—

 
 
Net periodic benefit cost for continuing operations
$
6,088

 
$
12,273

 
$
12,016

 
$
55,476

 
$
58,900

 
$
52,852
Schedule of Estimated Portion of Net Prior Service Cost and Net Actuarial Loss Remaining in Accumulated Other Comprehensive Income that is Expected to be Recognized as a Component of Net Periodic Benefit Cost in 2014
The estimated portions of net prior service cost (credit) and net actuarial loss remaining in accumulated other comprehensive income that is expected to be recognized as components of net periodic benefit costs in 2015 are as follows (in thousands):

 
Pension Benefits
 
Other Postretirement Benefits
Prior service cost (credit)
$
681

 
$
(6,209
)
Net actuarial loss
7,666

 
22,635

Net amount to be recognized
$
8,347

 
$
16,426
Schedule of Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss)
Changes in plan assets and benefit obligations recognized in other comprehensive income (loss) in 2014 are as follows (in thousands):

 
Pension Benefits
 
Other Postretirement Benefits
 
Total
Current year net actuarial loss
$
(63,507
)
 
$
(64,426
)
 
$
(127,933
)
Current year prior service (cost) credit
(4,530
)
 
76,544

 
72,014

Amortization of actuarial loss
2,292

 
15,570

 
17,862

Recognition of settlement loss
1,663

 
—

 
1,663

Amortization of prior service cost
246

 
1,227

 
1,473

Total
(63,836
)
 
28,915

 
(34,921
)
Deferred income taxes
218

 
884

 
1,102

Total recognized in other comprehensive income (loss), net of taxes
$
(63,618
)
 
$
29,799

 
$
(33,819
)
Summary of Key Assumptions Used
A summary of key assumptions used is as follows:
 
Pension Benefits
 
Other Postretirement Benefits
 
December 31,
 
December 31,
 
2014
 
2013
 
2012
 
2014
 
2013
 
2012
Weighted average assumptions used to determine benefit obligations:
 
 
 
 
 
 
 
 
 
 
 
Discount rate
4.32
%
 
5.24
%
 
4.29
%
 
4.34
%
 
5.28
%
 
4.44
%
Rate of compensation increase
3.70
%
 
3.70
%
 
3.70
%
 
—

 
—

 
—

Weighted average assumptions used to determine net periodic cost:
 
 
 
 
 
 
 
 
 
 
 
Discount rate
5.24
%
 
4.29
%
 
5.02
%
 
5.28
%
 
4.44
%
 
5.14
%
Expected return on plan assets
7.25
%
 
7.50
%
 
7.75
%
 
—

 
—

 
—

Rate of compensation increase
3.70
%
 
3.70
%
 
3.70
%
 
—

 
—

 
—
Summary of Assumed Health Care Cost Trend Rates
 
December 31,
 
2014
 
2013
 
2012
 
Pre-65
 
Post-65
 
Pre-65
 
Post-65
 
Pre-65
 
Post-65
Assumed health care cost trend rates at December 31:
 
 
 
 
 
 
 
 
 
 
 
Health care cost trend rate assumed for next year
6.90%
 
6.90%
 
7.00%
 
7.00%
 
7.50%
 
7.50%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)
4.50%
 
4.50%
 
4.50%
 
4.50%
 
5.00%
 
5.00%
Year that the rate reaches the ultimate trend rate
2027
 
2027
 
2027
 
2027
 
2019
 
2019
Schedule of Pension Trust's Strategic Asset Allocation Targets
The Pension Trust's strategic asset allocation targets for 2014 and the asset allocations as of December 31, 2014 and 2013 were as follows:

 
 
 
 
 
Actual Allocation
 
Strategic Allocation
 
Tactical Range
 
2014
 
2013
Equity Investments:
 
 
 
 
 
 
 
U.S. large-cap equity
33.0
%
 
25-41%
 
33.4
%
 
39.0
%
International equity
13.0
%
 
9-17%
 
11.9
%
 
14.3
%
U.S. mid-cap equity
14.0
%
 
10-18%
 
14.6
%
 
9.7
%
Total equity investments
60.0
%
 
50-70%
 
59.9
%
 
63.0
%
Fixed income investments
40.0
%
 
30-50%
 
38.7
%
 
36.5
%
Cash
—
%
 
0-5%
 
1.4
%
 
0.5
%
Total
100.0
%
 
 
 
100.0
%
 
100.0
%
Schedule of the Fair Values of Pension Trust's Assets by Asset Category
The fair values of the Pension Trust's assets, all of which are valued based on quoted market prices in active markets for identified assets (Level 1), were as follows (in thousands):

 
December 31,
Asset Class:
2014
 
2013
Cash and cash equivalents
$
3,477

 
$
1,224

Equity investments(a):
 
 
 
U.S. large cap equity
81,662

 
100,384

International equity
28,992

 
36,812

U.S. mid-cap equity
35,715

 
25,143

Fixed income investments:
 
 
 
Intermediate-term bond(b)
69,250

 
34,091

Long-term bond(c)
25,495

 
60,111

Total
$
244,591

 
$
257,765

_______________________________________________________________________________

(a)
Equity investments include investments in domestic and international mutual funds and U.S. common stocks investing in large- and mid-capitalization companies. Investments in mutual funds are valued at the net asset value per share multiplied by the number of shares held as of the measurement date and are traded on listed exchanges.
(b)
This fund seeks maximum total return through a diversified portfolio of fixed income instruments of varying maturities, which may be represented by forward or derivatives such as options, futures, contracts, or swap agreements. Fixed income instruments include bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public or private-sector entities. This fund also invests in high yield securities, mortgage-related securities and securities denominated in foreign currencies. This fund is valued at the net asset value per share multiplied by the number of shares held as of the measurement date and is traded on a listed exchange.
(c)
This fund invests in a diversified portfolio consisting primarily of high-quality bonds and other fixed income securities, including U.S. government obligations, mortgage-and asset-backed securities, corporate and municipal bonds, and collateralized mortgage obligations of varying maturities. This fund is valued at the net asset value per share multiplied by the number of shares held as of the measurement date and is traded on a listed exchange.
Schedule of One-percentage Point Change in the Trend Rate
A one-percentage-point change in the rate for each of these assumptions would have had the following effects as of and for the year ended December 31, 2014 (in thousands):

 
Increase (Decrease)
 
1-Percentage Point Increase
 
1-Percentage Point Decrease
Healthcare cost trend:
 
 
 
Effect on total service and interest cost components
$
6,244

 
$
(5,002
)
Effect on other postretirement benefit obligation
$
92,287

 
$
(74,174
)
Discount rate:
 
 
 
Effect on other postretirement service and interest cost components
$
48

 
$
(184
)
Effect on other postretirement benefit obligation
$
(77,097
)
 
$
95,043

Effect on current other postretirement expense
$
(5,634
)
 
$
6,820

Effect on pension service and interest cost components
$
(167
)
 
$
150

Effect on pension benefit obligation
$
(38,267
)
 
$
47,783

Effect on current year pension expense
$
(1,813
)
 
$
3,138

Expected return on plan assets:
 
 
 
Effect on current year pension expense
$
(2,512
)
 
$
2,512

Rate of compensation increase:
 
 
 
Effect on pension service and interest cost components
$
790

 
$
(692
)
Effect on pension benefit obligation
$
6,383

 
$
(5,749
)
Effect on current year pension expense
$
1,228

 
$
(1,120
)
Schedule of Estimated Benefit Payments from the Plans that are Expected to be Paid
The following estimated benefit payments from the plans, which reflect expected future service as appropriate, are expected to be paid as follows (in thousands):

 
Pension Benefits
 
Other Postretirement Benefits
2015
$
17,670

 
$
25,740

2016
$
15,232

 
$
27,252

2017
$
16,148

 
$
28,600

2018
$
17,051

 
$
29,886

2019
$
17,955

 
$
30,801

Years 2020-2024
$
100,590

 
$
162,291
Schedule of Additional Information Regarding the 1974 Pension Plan
The following table provides additional information regarding the 1974 Pension Plan as of December 31, 2014 (in thousands):

 
 
 
 
Pension
Protection Act
Zone Status
 
 
 
Contributions of Walter
Energy
 
 
 
 
 
 
EIN/Pension
Plan Number
 
FIP/RP Status
Pending/Implemented
 
Surcharge
Imposed
 
Expiration Date of
Collective-Bargaining
Agreement
Pension Fund
 
2014
 
2013
 
2014
 
2013
 
2012
 
United Mine Workers of America 1974 Pension Plan(1)
 
52-1050282/002
 
Red
 
Yellow
 
Yes
 
$
17,854

 
$
19,670

 
$
20,948

 
Yes
 
12/31/2016
_______________________________________________________________________________

(1)
The enrolled actuary for the 1974 Pension Plan certified to the U.S. Department of the Treasury and the plan sponsor that the plan is in "Critical Status" for the plan year beginning July 1, 2014 and ending June 30, 2015. The plan adopted a funding improvement plan on May 25, 2012.