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Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Current Assets:    
Accrued liabilities $ 613 $ 474
Allowance for doubtful accounts 124 148
Derivative contracts (83) 723
Total current deferred income tax assets 654 1,345
Non-Current Assets:    
Alternative minimum tax credits 5,890 5,873
Net operating loss carry-forwards 114 161
Percentage depletion carry-forwards 4,287 2,946
Derivative contracts 91 520
Total non-current assets 10,382 9,500
Non-Current Liabilities:    
Basis differences relating to managed partnerships 1,492 1,989
Depletion and depreciation 33,084 25,425
Total non-current liabilities 34,576 27,414
Net non-current deferred income tax liabilities $ 24,194 $ 17,914