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Income Taxes (Details 4) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:    
Net operating loss carryforwards $ 169,533 $ 210,955
Inventory 6,684 2,254
Alternative minimum tax credit carryforwards 5,615 5,920
Accrued liabilities 14,446 15,392
Foreign tax credit carryforwards 124,850 110,191
Other 40,608 37,584
Subtotal 361,736 382,296
Valuation allowances (102,418) (86,054)
Total deferred tax assets 259,318 296,242
Deferred tax liabilities:    
Property, plant and equipment (209,297) (256,502)
Basis difference in the Partnership (104,079) (65,422)
Total deferred tax liabilities (313,376) (321,924)
Net deferred tax liabilities $ (54,058) $ (25,682)