Subsequent Event Subsequent Event (Details) (USD $) In Millions, unless otherwise specified			12 Months Ended	0 Months Ended
	Dec. 31, 2013 Portfolio Sale, Total [Member] sqft properties	Jan. 30, 2014 Portfolio Sale, Total [Member] Subsequent Event [Member]	Dec. 31, 2013 Portfolio Sale, Second Settlement [Member]	Jan. 30, 2014 Portfolio Sale, Second Settlement [Member] Subsequent Event [Member] acre sqft properties
Subsequent Event [Line Items]
Sale Proceeds	$ 697.3	$ 697.3
Proceeds from Sale of Real Estate			$ 329.6	$ 329.6
Number of Real Estate Properties	97			48
Square Footage of Real Estate Property	6,600,000			2,600,000
Area of Land				19