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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
ollowing items are included in accumulated other comprehensive loss:
 
 
 
Pension,
 
 
 
 
 
 
 
Postretirement
 
 
 
 
 
 
 
and Other
 
 
 
Accumulated
 
 
 
Post-
 
 
 
Other
 
Derivative
 
Employment
 
Available-for-
 
Comprehensive
 
Instruments
 
Benefits
 
Sale Securities
 
Loss
 
(In thousands)
Balance at December 31, 2012
$
2,244

 
$
(18,286
)
 
$
(465
)
 
$
(16,507
)
Unrealized gains
1,197

 
1,938

 
4,653

 
7,788

Amounts reclassified from accumulated other comprehensive income
(1,339
)
 
1,252

 
200

 
113

Balance at September 30, 2013
$
2,102

 
$
(15,096
)
 
$
4,388

 
$
(8,606
)
Schedule of comprehensive income reclassifications [Table Text Block]
The following amounts were reclassified out of accumulated other comprehensive loss:

 
 
Amount Reclassified from
 
 
 
 
Accumulated Comprehensive Loss
 
Line Item in the
Details about accumulated other
 
Three Months Ended
 
Nine Months Ended
 
Condensed Consolidated
comprehensive income components
 
September 30, 2013
 
September 30, 2013
 
Statement of Operations
 
 
(In thousands)
 
 
Derivative instruments
 
$
692

 
$
2,093

 
Revenues
 
 
(249
)
 
(754
)
 
Provision for (benefit from) income taxes
 
 
$
443

 
$
1,339

 
Net of tax
 
 
 
 
 
 
 
Pension, postretirement and other post-employment benefits
 
 
 
 
 
 
Amortization of prior service credits
 
$
5,573

 
$
11,154

1 
 
Amortization of actuarial gains (losses), net
 
(3,823
)
 
(13,108
)
1 
 
 
 
1,750

 
(1,954
)
 
Total before tax
 
 
(631
)
 
702

 
Provision for (benefit from) income taxes
 
 
$
1,119

 
$
(1,252
)
 
Net of tax
 
 
 
 
 
 
 
Available-for-sale securities
 
$
(4
)
 
$
(313
)
2 
Interest and investment income
 
 
2

 
113

 
Provision for (benefit from) income taxes
 
 
$
(2
)
 
$
(200
)
 
Net of tax
1 Production-related benefits and workers' compensation costs are included in costs to produce coal. See Note 14, "Workers' Compensation Expense" and Note 15 "Employee Benefit Plans" for more information about pension, postretirement and postemployment benefit costs.
2 The gains and losses on sales of available-for-sale-securities are determined on a specific identification basis.