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POSTRETIREMENT MEDICAL BENEFITS (Tables)
 12 Months Ended
Dec. 31, 2015
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): 
2015
$
1.8

2014
2.0

2013
2.2
Schedule of Workers Compensation obligation
The following table shows the changes in the Company’s workers’ compensation obligation:
 
December 31,
2015
 
2014
(In thousands)
Workers’ compensation, beginning of year (including current portion)
$
6,986

 
$
7,461

Accretion
127

 
200

Claims paid
(448
)
 
(405
)
Actuarial changes
(1,007
)
 
(270
)
Workers’ compensation, end of year
5,658

 
6,986

Less current portion, included in Other current liabilities
(590
)
 
(671
)
Workers’ compensation, less current portion
$
5,068

 
$
6,315
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,
2015
 
2014
 
(In thousands)
Change in benefit obligations:
 
 
 
Net benefit obligation at beginning of year
$
306,418

 
$
284,329

Service cost
4,217

 
3,289

Interest cost
11,629

 
12,814

Plan participant contributions
185

 
149

Actuarial loss (gain)
(7,322
)
 
19,441

Gross benefits paid
(17,013
)
 
(14,860
)
Federal subsidy on benefits paid
1,259

 
1,256

Net benefit obligation at end of year
299,373

 
306,418

Change in plan assets:
 
 
 
Employer contributions
16,828

 
14,711

Plan participant contributions
185

 
149

Gross benefits paid
(17,013
)
 
(14,860
)
Fair value of plan assets at end of year
—

 
—

Unfunded status at end of year
$
(299,373
)
 
$
(306,418
)
Amounts recognized in the balance sheet consist of:
 
 
 
Current liabilities
$
(13,855
)
 
$
(13,263
)
Noncurrent liabilities
(285,518
)
 
(293,156
)
Accumulated other comprehensive loss
31,085

 
39,716

Net amount recognized
$
(268,288
)
 
$
(266,703
)
Amounts recognized in accumulated other comprehensive loss consists of:
 
 
 
Net actuarial loss
$
35,534

 
$
44,800

Prior service credit
(4,449
)
 
(5,084
)
 
$
31,085

 
$
39,716
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 2016 (in millions): 
Actuarial loss
$
1.4

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,
2015
 
2014
 
2013
 
(In thousands)
Components of net periodic benefit cost:
 
 
 
 
 
Service cost
$
4,217

 
$
3,289

 
$
4,436

Interest cost
11,629

 
12,814

 
12,139

Amortization of:
 
 
 
 
 
Prior service credit
(636
)
 
(635
)
 
(636
)
Actuarial loss
1,944

 
653

 
4,641

Total net periodic benefit cost
$
17,154

 
$
16,121

 
$
20,580

The following table shows the net periodic postretirement medical benefit costs that relate to current and former mining operations: 
 
Years Ended December 31,
 
2015
 
2014
 
2013
 
(In thousands)
Former mining operations
$
8,137

 
$
9,614

 
$
12,475

Current operations
9,017

 
6,507

 
8,105

Total net periodic benefit cost
$
17,154

 
$
16,121

 
$
20,580
Schedule of weighted-average assumptions used
The weighted-average assumptions used to determine the benefit obligations as of the end of each year were as follows: 
 
December 31,
 
2015
 
2014
Discount rate
4.10% - 4.65%
 
3.75% - 4.25%
Measurement date
December 31, 2015
 
December 31, 2014
The weighted-average assumptions used to determine net periodic benefit cost were as follows: 
 
December 31,
 
2015
 
2014
 
2013
Discount rate
3.75% - 4.25%
 
4.50% - 5.05%
 
3.60% - 4.15%
Measurement date
December 31, 2014
 
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,
 
2015
 
2014
Health care cost trend rate assumed for next year
7.00
%
 
6.50
%
Rate to which the cost trend is assumed to decline (ultimate trend rate)
4.75
%
 
5.00
%
Year that the trend rate reaches the ultimate trend rate
2025

 
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
$
3,235

 
$
(2,444
)
Effect on postretirement medical benefit obligation
$
41,360

 
$
(33,667
)
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)
2016
$
13,855

 
$
(1,388
)
 
$
12,467

2017
14,250

 
(1,457
)
 
12,793

2018
14,744

 
(1,516
)
 
13,228

2019
15,205

 
(1,573
)
 
13,632

2020
15,627

 
(1,623
)
 
14,004

Years 2021 - 2025
82,997

 
(8,830
)
 
74,167
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,
2015
 
2014
(In thousands)
Actuarial present value of benefit obligation:
 
 
 
Expected claims from terminated employees
$
2,472

 
$
953

Amounts owed to existing claimants
15,318

 
13,054

Total present value of benefit obligation
17,790

 
14,007

Plan assets at fair value
570

 
2,755

Excess of the black lung benefit obligation over trust assets
$
17,220

 
$
11,252
Schedule of allocation of plan assets
The fair value of the Company’s Black Lung trust assets by asset category is as follows: 
 
Fair Value as of
 
December 31, 2015
 
December 31, 2014
 
(In thousands)
U.S. treasury securities
$
256

 
$
2,615

Cash and cash equivalents
314

 
140

 
$
570

 
$
2,755