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Other Expense, Other Income and Non-Operating Other Income (Expense), net (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Other expense:        
Losses on sales and disposals of property and equipment $ 536 $ 914 $ 551 $ 895
Loss on contractual obligations associated with carbon credits   896   936
Miscellaneous expense 19 511 171 552
Total other expense 555 2,321 722 2,383
Other income:        
Gains on carbon credits   990   1,030
Settlements of litigation and potential litigation   10   757
Miscellaneous income 112 105 348 190
Total other income 112 1,105 348 1,977
Non-operating other income (expense), net:        
Interest income 24 17 48 41
Miscellaneous income 263   263  
Miscellaneous expense (20) (19) (39) (36)
Total non-operating other income (expense), net $ 267 $ (2) $ 272 $ 5