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Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current Assets:    
Accrued liabilities $ 683 $ 613
Allowance for doubtful accounts 118 124
Derivative contracts 677 (83)
Total current deferred income tax assets 1,478 654
Non-Current Assets:    
Alternative minimum tax credits 5,852 5,890
Net operating loss carry-forwards 168 114
Percentage depletion carry-forwards 4,543 4,287
Derivative contracts   91
Total non-current assets 10,563 10,382
Non-Current Liabilities:    
Basis differences relating to managed partnerships 2,462 1,492
Depletion and depreciation 39,694 33,084
Derivative contracts 369  
Total non-current liabilities 42,525 34,576
Net non-current deferred income tax liabilities $ 31,962 $ 24,194