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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)

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