Deferred Costs Deferred Costs (Details Textuals) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Deferred Costs (Textuals) [Abstract]
Capitalized Internal Direct Leasing Costs	$ 1.4	$ 1.3	$ 4.3	$ 4.0