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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following items are included in accumulated other comprehensive income (loss):
 
 
 
 
 
 
 
 
 
 
 
 
 
Pension,
 
 
 
 
 
 
 
 
Postretirement
 
 
 
Accumulated
 
 
 
 
and Other Post-
 
 
 
Other
 
 
Derivative
 
Employment
 
Available-for-
 
Comprehensive
 
 
Instruments
 
Benefits
 
Sale Securities
 
Income (Loss)
 
 
(In thousands)
Balance at
January 1, 2013
$
2,244

 
$
(18,286
)
 
$
(465
)
 
$
(16,507
)
Unrealized gains
168

 
48,482

 
5,935

 
54,585

Amounts reclassified from accumulated other comprehensive income (loss)
(1,847
)
 
916

 
545

 
(386
)
Balance at
December 31, 2013
565

 
31,112

 
6,015

 
37,692

Unrealized gains (losses)
3,677

 
(22,516
)
 
(5,727
)
 
(24,566
)
Amounts reclassified from accumulated other comprehensive income (loss)
(1,692
)
 
(5,736
)
 
(2,457
)
 
(9,885
)
Balance at
December 31, 2014
$
2,550

 
$
2,860

 
$
(2,169
)
 
$
3,241
Schedule of comprehensive income reclassifications
The following amounts were reclassified out of accumulated other comprehensive income (loss) during the years ended December 31, 2014 and 2013, respectively:

Details about accumulated
other comprehensive income components
 
 
Reclassifications
 
Line Item in the
 Consolidated Statement of Operations
 
 
 
2014
 
2013
 
 
 
 
 
(in thousands)
 
 
Derivative instruments
 
 
$
2,643

 
$
2,886

 
Revenues
 
 
 
(951
)
 
(1,039
)
 
Provision for (benefit from) income taxes
 
 
 
$
1,692

 
$
1,847

 
Net of tax
 
 
 
 
 
 
 
 
Pension, postretirement and other post-employment benefits
 
 
Amortization of prior service credits
 
 
$
11,760

1 
$
13,705

 
 
Amortization of net actuarial gains (losses)
 
 
(2,797
)
1 
(15,136
)
 
 
 
 
 
8,963

 
(1,431
)
 
Total before tax
 
 
 
(3,227
)
 
515

 
Provision for (benefit from) income taxes
 
 
 
$
5,736

 
$
(916
)
 
Net of tax
 
 
 
 
 
 
 
 
Available-for-sale securities
 
 
$
3,838

2 
$
(852
)
 
Interest and investment income
 
 
 
(1,381
)
 
307

 
Provision for (benefit from) income taxes
 
 
 
$
2,457

 
$
(545
)
 
Net of tax
1 Production-related benefits and workers' compensation costs are included in costs to produce coal.
2 The gains and losses on sales of available-for-sale-securities are determined on a specific identification basis.