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Accumulated Other Comprehensive Income (Loss)
 12 Months Ended
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Accumulated Other Comprehensive Income (Loss)
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, 2014
$
565

 
$
31,112

 
$
6,015

 
$
37,692

Unrealized gains
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

Unrealized gains (losses)
3,903

 
(8,723
)
 
(3,333
)
 
(8,153
)
Amounts reclassified from accumulated other comprehensive income (loss)
(6,128
)
 
5,142

 
4,083

 
3,097

Balance at
December 31, 2015
$
325

 
$
(721
)
 
$
(1,419
)
 
$
(1,815
)

 
The following amounts were reclassified out of accumulated other comprehensive income (loss) during the years ended December 31, 2015 and 2014, respectively:

Details about accumulated
other comprehensive income components
 
 
Reclassifications
 
Line Item in the
 Consolidated Statement of Operations
 
 
 
2015
 
2014
 
 
 
 
 
(in thousands)
 
 
Derivative instruments
 
 
$
9,575

 
$
2,643

 
Revenues
 
 
 
(3,447
)
 
(951
)
 
Provision for (benefit from) income taxes
 
 
 
$
6,128

 
$
1,692

 
Net of tax
 
 
 
 
 
 
 
 
Pension, postretirement and other post-employment benefits
 
 
Amortization of prior service credits
 
 
$
8,335

1 
$
11,760

 
 
Amortization of net actuarial gains (losses)
 
 
(16,369
)
1 
(2,797
)
 
 
 
 
 
(8,034
)
 
8,963

 
Total before tax
 
 
 
2,892

 
(3,227
)
 
Provision for (benefit from) income taxes
 
 
 
$
(5,142
)
 
$
5,736

 
Net of tax
 
 
 
 
 
 
 
 
Available-for-sale securities
 
 
$
(6,391
)
2 
$
3,838

 
Interest and investment income
 
 
 
2,308

 
(1,381
)
 
Provision for (benefit from) income taxes
 
 
 
$
(4,083
)
 
$
2,457

 
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.