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Mine Closure and Asset Impairment Costs (Tables)
12 Months Ended
Dec. 31, 2012
Restructuring and Related Activities [Abstract]  
Schedule of Restructuring and Related Costs [Table Text Block]
The following costs are reflected in the line “Mine closure and asset impairment costs” on the consolidated statements of operations for the year ended December 31, 2012:
 
Parts and supplies inventory writedown
$
2,598

Impairment of property, plant and equipment
95,641

Impairment of coal properties and deferred development costs
403,279

Royalty obligations
11,546

Employee termination benefits
12,274

Pension, postretirement and occupational disease curtailment gain, net (see notes 17 and 18)
(1,770
)
 
$
523,568