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POSTRETIREMENT MEDICAL BENEFITS (Tables)
 12 Months Ended
Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of contributions to Combined Benefit Fund
The following payments were made to the CBF (in millions): 
2013
$
2.2

2012
2.3

2011
2.6
Schedule of Workers Compensation obligation
The following table shows the changes in the Company’s workers’ compensation obligation:
 
December 31,
2013
 
2012
(In thousands)
Workers’ compensation, beginning of year (including current portion)
$
9,530

 
$
11,626

Accretion
166

 
204

Claims paid
(581
)
 
(475
)
Actuarial changes
(1,654
)
 
(1,825
)
Workers’ compensation, end of year
7,461

 
9,530

Less current portion
(717
)
 
(820
)
Workers’ compensation, less current portion
$
6,744

 
$
8,710
Postretirement Medical Benefits [Member]
  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of benefit obligations and amounts recognized in financial statements
The following table sets forth the actuarial present value of postretirement medical benefit obligations and amounts recognized in the Company’s financial statements: 
 
December 31,
2013
 
2012
 
(In thousands)
Change in benefit obligations:
 
 
 
Net benefit obligation at beginning of year
$
333,842

 
$
258,641

Liability acquired
—

 
49,241

Service cost
4,436

 
3,555

Interest cost
12,139

 
12,363

Plan participant contributions
132

 
129

Actuarial loss (gain)
(53,230
)
 
22,342

Gross benefits paid
(14,220
)
 
(13,544
)
Federal subsidy on benefits paid
1,230

 
1,115

Net benefit obligation at end of year
284,329

 
333,842

Change in plan assets:
 
 
 
Employer contributions
14,088

 
13,415

Plan participant contributions
132

 
129

Gross benefits paid
(14,220
)
 
(13,544
)
Fair value of plan assets at end of year
—

 
—

Unfunded status at end of year
$
(284,329
)
 
$
(333,842
)
Amounts recognized in the balance sheet consist of:
 
 
 
Current liabilities
$
(13,955
)
 
$
(14,068
)
Noncurrent liabilities
(270,374
)
 
(319,775
)
Accumulated other comprehensive loss
20,292

 
77,528

Net amount recognized
$
(264,037
)
 
$
(256,315
)
Amounts recognized in accumulated other comprehensive loss consists of:
 
 
 
Net actuarial loss
$
26,012

 
$
83,884

Prior service credit
(5,720
)
 
(6,356
)
 
$
20,292

 
$
77,528
Schedule of amounts in Accumulated Other Comprehensive Income (Loss) to be recognized over next fiscal year
The following amounts will be amortized from accumulated other comprehensive loss into net periodic benefit cost in 2014 (in millions): 
Actuarial loss
$
0.7

Prior service credit
0.6
Components of net periodic benefit cost
The components of net periodic postretirement medical benefit cost are as follows: 
 
Years Ended December 31,
2013
 
2012
 
2011
 
(In thousands)
Components of net periodic benefit cost:
 
 
 
 
 
Service cost
$
4,436

 
$
3,555

 
$
493

Interest cost
12,139

 
12,363

 
10,510

Amortization of:
 
 
 
 
 
Transition obligation
—

 
93

 
93

Prior service credit
(636
)
 
(636
)
 
(636
)
Actuarial loss
4,641

 
3,116

 
255

Total net periodic benefit cost
$
20,580

 
$
18,491

 
$
10,715

The following table shows the net periodic postretirement medical benefit costs that relate to current and former mining operations: 
 
Years Ended December 31,
 
2013
 
2012
 
2011
 
(In thousands)
Former mining operations
$
12,475

 
$
11,314

 
$
9,259

Current operations
8,105

 
7,177

 
1,456

Total net periodic benefit cost
$
20,580

 
$
18,491

 
$
10,715
Schedule of weighted-average assumptions used
The weighted-average assumptions used to determine net periodic benefit cost were as follows: 
 
December 31,
 
2013
 
2012
 
2011
Discount rate
3.60% - 4.15%
 
4.10%
 
5.15%
Measurement date
December 31, 2012
 
December 31, 2011
 
December 31, 2010
The weighted-average assumptions used to determine the benefit obligations as of the end of each year were as follows: 
 
December 31,
 
2013
 
2012
Discount rate
4.50% - 5.05%
 
3.60% - 4.15%
Measurement date
December 31, 2013
 
December 31, 2012
Schedule of assumed health care trend rate
The following presents information about the assumed health care trend rate: 
 
December 31,
 
2013
 
2012
Health care cost trend rate assumed for next year
6.75
%
 
7.00
%
Rate to which the cost trend is assumed to decline (ultimate trend rate)
5.00
%
 
5.00
%
Year that the trend rate reaches the ultimate trend rate
2021

 
2021
Schedule of effect of a one percent change on the health care cost trend
The effect of a one percent change on the health care cost trend rate used to calculate periodic postretirement medical benefit costs and the related benefit obligation are summarized in the table below: 
 
Postretirement Medical Benefits
 
1 % Increase
 
1 % Decrease
 
(In thousands)
Effect on service and interest cost components
$
3,148

 
$
(2,442
)
Effect on postretirement medical benefit obligation
$
35,464

 
$
(30,096
)
Schedule of expected benefit payments
The following benefit payments and Medicare D subsidy (which the Company receives as a benefit partially offsetting its prescription drug costs for retirees and their dependents) are expected by the Company:
 
 
Postretirement
Medical  Benefits
 
Medicare D
Subsidy
 
Net 
Postretirement
Medical Benefits
 
(In thousands)
2014
$
13,955

 
$
(1,249
)
 
$
12,706

2015
14,522

 
(1,293
)
 
13,229

2016
14,975

 
(1,336
)
 
13,639

2017
15,408

 
(1,386
)
 
14,022

2018
16,191

 
(1,432
)
 
14,759

Years 2019 - 2023
85,342

 
(7,807
)
 
77,535
Pneumoconiosis (Black Lung) Benefits [Member]
  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of net funded status
The following table sets forth the funded status of the Company’s black lung obligation: 
 
December 31,
2013
 
2012
(In thousands)
Actuarial present value of benefit obligation:
 
 
 
Expected claims from terminated employees
$
876

 
$
1,139

Amounts owed to existing claimants
13,267

 
15,061

Total present value of benefit obligation
14,143

 
16,200

Plan assets at fair value, primarily government-backed securities
5,468

 
7,844

Excess of the black lung benefit obligation over trust assets
$
8,675

 
$
8,356
Schedule of allocation of plan assets
The fair value of the Company’s Black Lung trust assets by asset category is as follows: 
 
December 31, 2013
 
 
 
Quoted Prices
in Active
Markets for
Identical Assets
 
Significant
Other
Observable
Inputs
 
Fair Value
 
Level 1
 
Level 2
 
(In thousands)
U.S. treasury securities
$
5,280

 
$
—

 
$
5,280

Mortgage-backed securities
185

 
—

 
185

Cash and cash equivalents
3

 
3

 
—

 
$
5,468

 
$
3

 
$
5,465

 
 
December 31, 2012
 
 
 
Quoted Prices
in Active
Markets for
Identical Assets
 
Significant
Other
Observable
Inputs
 
Fair Value
 
Level 1
 
Level 2
 
(In thousands)
U.S. treasury securities
$
7,548

 
$
—

 
$
7,548

Mortgage-backed securities
269

 
—

 
269

Cash and cash equivalents
27

 
27

 
—

 
$
7,844

 
$
27

 
$
7,817