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Accumulated Other Comprehensive Income (Loss)
 12 Months Ended
Dec. 31, 2017
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)
Predecessor Company
 
 
 
 
 
 
 
January 1, 2016
$
325

 
$
(721
)
 
$
(1,419
)
 
$
(1,815
)
Unrealized gains (losses)
(138
)
 
—

 
701

 
563

Amounts reclassified from accumulated other comprehensive income (loss)
(316
)
 
(1,363
)
 
1,225

 
(454
)
Fresh start accounting adjustment
129

 
2,084

 
(507
)
 
1,706

October 1, 2016
—

 
—

 
—

 
—

Successor Company
 
 
 
 
 
 
 
Unrealized gains (losses)
—

 
24,067

 
387

 
24,454

Amounts reclassified from accumulated other comprehensive income (loss)
—

 
—

 
—

 
—

December 31, 2016
$
—

 
$
24,067

 
$
387

 
$
24,454

Unrealized gains (losses)
497

 
(3,589
)
 
—

 
(3,092
)
Amounts reclassified from accumulated other comprehensive income (loss)
150

 
(758
)
 
(387
)
 
(995
)
December 31, 2017
$
647

 
$
19,720

 
$
—

 
$
20,367



The unrealized gain in the successor period ended December 31, 2016 is the result of changes in the discount rates used to calculate our pension, postretirement health and occupational disease obligations.
The following amounts were reclassified out of accumulated other comprehensive income (loss) during the respective periods:

Details about accumulated
other comprehensive income components
 
Successor
Predecessor
 
Line Item in the
 Consolidated Statement of Operations
 
 
Year Ended December 31, 2017
 
October 2 through December 31, 2016
January 1 through October 1, 2016
 
 
(in thousands)
 
 
 
 
 
 
 
Derivative instruments
 


 




 
 
Coal hedges
 
$
—

 
$
—

$
397

 
Revenues
Interest rate hedges
 
(150
)
 
 
—

 
Interest expense
 
 
—

 
—

(81
)
 
Provision for (benefit from) income taxes
 
 
$
(150
)
 
$
—

$
316

 
Net of tax
 
 
 
 
 
 
 
 
Pension, postretirement and other post-employment benefits
 
 
 
 
 
 
 
Amortization of prior service credits 1
 
$
—

 
$
—

$
7,854

 
 
Amortization of net actuarial gains (losses) 1
 
—

 
—

(6,010
)
 
 
Curtailments
 
(773
)
 
—

—

 
 
Settlements
 
1,531

 
—

—

 
 
 
 
758

 
—

1,844

 
Total before tax
 
 
—

 
—

(481
)
 
Provision for (benefit from) income taxes
 
 
$
758

 
$
—

$
1,363

 
Net of tax
 
 
 
 
 
 
 
 
Available-for-sale securities 2
 
$
387

 
$
—

$
(2,263
)
 
Interest and investment income
 
 
—

 
—

1,038

 
Provision for (benefit from) income taxes
 
 
$
387

 
$
—

$
(1,225
)
 
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.