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Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Current Assets:    
Accrued liabilities $ 593 $ 610
Allowance for doubtful accounts 188 124
Derivative contracts 3 52
Total current assets 784 786
Current Liabilities:    
Derivative contracts 250 6,333
Total current liabilities 250 6,333
Net current deferred income tax assets (534)  
Net current deferred income tax liabilities (assets)   5,547
Non-Current Assets:    
Alternative minimum tax credits 5,319 5,722
Net operating loss carry-forwards 575 620
Percentage depletion carry-forwards 3,751 3,959
Total non-current assets 9,645 10,301
Non-Current Liabilities:    
Basis differences relating to managed partnerships 6,238 4,300
Depletion and depreciation 41,290 44,192
Total non-current liabilities 47,528 48,492
Net non-current deferred income tax liabilities $ 37,883 $ 38,191