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Subsequent Events Subsequent Events (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended |
--- | --- | ---
Apr. 10, 2013 | Apr. 25, 2013
Subsequent Event [Line Items] |  |
Ground Lease Buy-out, Total Cost |  | $ 20.8
Stock Issued During Period, Shares, New Issues | 12,650,000 |
Stock Issued During Period, Shares, Other | 1,650,000 |
Net proceeds from issuance of common shares | $ 181.7 |

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