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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2016
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)
Predecessor Company
 
 
 
 
 
 
 
January 1, 2015
$
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

December 31, 2015
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
—

 
24,067

 
387

 
24,454

Amounts reclassified from accumulated other comprehensive income (loss)
—

 
—

 
—

 
—

December 31, 2016
$
—

 
$
24,067

 
$
387

 
$
24,454
Schedule of comprehensive income reclassifications
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
 
 
 
October 2 through December 31, 2016
January 1 through October 1, 2016
 
Year Ended December 31, 2015
 
 
 
 
 
(in thousands)
(in thousands)
 
 
Derivative instruments
 
 
$
—

$
397

 
$
9,575

 
Revenues
 
 
 
—

(81
)
 
(3,447
)
 
Provision for (benefit from) income taxes
 
 
 
$
—

$
316

 
$
6,128

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

$
7,854

 
$
8,335

 
 
Amortization of net actuarial gains (losses) 1
 
 
—

(6,010
)
 
(16,369
)
 
 
 
 
 
—

1,844

 
(8,034
)
 
Total before tax
 
 
 
—

(481
)
 
2,892

 
Provision for (benefit from) income taxes
 
 
 
$
—

$
1,363

 
$
(5,142
)
 
Net of tax
 
 
 
 
 
 
 
 
 
Available-for-sale securities 2
 
 
$
—

$
(2,263
)
 
$
(6,391
)
 
Interest and investment income
 
 
 
—

1,038

 
2,308

 
Provision for (benefit from) income taxes
 
 
 
$
—

$
(1,225
)
 
$
(4,083
)
 
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.