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Shareholders' Equity (Common Stock, Distributions, Prospectus Supplement, Preferred Stock, and Rights Agreement) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | May 08, 2013
Equity [Abstract] |  |  |
Common stock, voting rights | one vote per share |  |
minimum % of REIT taxable income to be paid as dividend annually | 90.00% |  |
Special dividend, amount of cash payable above lottery |  | 20.00% |
Special dividend, amount |  | $ 352.2 |
Special dividend (dollars per share) |  | $ 5.68 |
Dividends - Stock, Shares |  | 9,688,568 |
Special Dividend, amount paid in cash |  | 77.8 |
Maximum common stock value authorized under prospectus supplement |  |  | $ 100
Preferred stock, shares authorized | 30,000,000 | 30,000,000 |

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