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Summary of Significant Accounting Policies (Investments in Unconsolidated Affiliates) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Summary of Significant Accounting Policies [Abstract] |  |
Net difference between investment and underlying equity in unconsolidated affiliates, amortization period (in years) | 40 years |
Net difference between investment and underlying equity in unconsolidated affiliates | $ 11,674 | $ 2,456

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- Definition Net Difference of Investment in Unconsolidated Affiliates and the Equity of Unconsolidated Affiliates + References No definition available. + Details
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- Definition Net Difference of Investment in Unconsolidated Affiliates and the Equity of Unconsolidated Affiliates, Amortization Period in Years + References No definition available. + Details
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- Details
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