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Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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Summary of accrued liabilities |  |
Accrued salaries and other benefits | $ 70,065 | $ 63,706
Accrued income and other taxes | 109,276 | 143,625
Accrued warranty expense | 3,879 | 7,703
Accrued interest | 8,366 | 9,163
Interest rate swaps fair value | 14,250 | 24,432
Deferred income taxes | 3,543 | 10,241
Accrued start-up and commissioning expenses | 14,597 | 11,027
Accrued other liabilities | 55,078 | 60,654
Accrued liabilities | $ 279,054 | $ 330,551

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