Stockholders' Equity (Details) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Aug. 08, 2014 sqft	Apr. 14, 2014	Mar. 11, 2014	Dec. 31, 2013	May 13, 2013	Apr. 12, 2013
Stockholders' Equity Note [Abstract]
Common Stock, Shares, Issued		220,078,986		220,078,986		18,000,000		8,700,000	193,236,454		16,500,000
Proceeds from Issuance of Common Stock	$ 98,500,000	$ 223,400,000	$ 165,100,000	$ 321,912,000	$ 826,529,000
Area of Real Estate Property						698,000
Preferred Stock, Par or Stated Value Per Share		$ 1		$ 1			$ 1.00		$ 1	$ 1.00
Preferred Stock, Redemption Price Per Share							$ 25.00			$ 25.00
Preferred Stock, Redemption Amount							94,800,000			74,800,000
Preferred share original issuance costs		$ 0	$ 0	$ (3,530,000)	$ (2,656,000)