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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Interest cost capitalized and incurred |  |  |
Interest incurred | $ 1,233 | $ 1,283 | $ 1,808
Interest capitalized | 513 | 394 | 195
Interest expense | $ 720 | $ 889 | $ 1,613

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