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