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Income Taxes (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Net operating loss carryforwards $ 8,028 $ 37,668
Inventory 3,642 4,405
Alternative minimum tax credit carryforwards 1,496 5,685
Accrued liabilities 11,466 7,894
Other 4,913 0
Subtotal 29,545 55,652
Valuation allowances (633) (633)
Total deferred tax assets 28,912 55,019
Deferred tax liabilities:    
Property, plant and equipment (53,495) (126,670)
Basis difference in the Partnership (148,421) (136,438)
Other (5,562) (10,583)
Total deferred tax liabilities (207,478) (273,691)
Net deferred tax liabilities $ (178,566) $ (218,672)