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Other Expense, Other Income and Non-Operating Other Income, net (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Other expense:      
Realized and unrealized losses on contractual obligations associated with carbon credits $ 1,844 $ 644  
Losses on sales and disposals of property and equipment 1,280 460 378
Miscellaneous expense, operating 699 158 149
Total other expense 3,823 1,262 527
Other Operating Income      
Realized and unrealized gains on carbon credits 1,995 644  
Settlements of litigation and potential litigation 1,562   50
Property insurance recoveries in excess of losses incurred   7,518  
Miscellaneous Income, Operating 381 265 237
Total other income 3,938 8,427 287
Non-operating other income, net:      
Interest income 77 133 216
Miscellaneous income, Non-Operating     1
Miscellaneous expense, Non-Operating (77) (80) (87)
Total non-operating other income, net   $ 53 $ 130