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Notes Payable - Line of Credit Covenants (Details) (USD $) In Billions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Notes Payable [Abstract] |
U.S. Covered Terrorism Losses, Percent | 0.85
Insurance Provider, Covered Terrorism Losses, Percent | 0.1
Aggregate Insured Terrorism Losses | $ 100

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