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Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 210,955 | $ 243,023
Inventory | 2,254 | 4,942
Alternative minimum tax credit carryforwards | 5,920 | 13,020
Accrued liabilities | 15,392 | 14,627
Foreign tax credit carryforwards | 110,191 | 100,266
Other | 59,147 | 34,714
Subtotal | 403,859 | 410,592
Valuation allowances | (86,054) | (76,056)
Total deferred tax assets | 317,805 | 334,536
Deferred tax liabilities: |  |
Property, plant and equipment | (255,184) | (333,948)
Basis difference in the Partnership | (65,422) | (69,922)
Goodwill and intangibles |  | 124
Total deferred tax liabilities | (320,606) | (403,746)
Net deferred tax liabilities | $ (2,801) | $ (69,210)

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