Accounts Receivable/Deferred Rent Receivable (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts Receivable and Deferred Rent Receivable [Abstract]
Allowance for Doubtful Accounts Receivable	$ 7,800,000	$ 7,000,000
Provision for Doubtful Accounts	$ 1,800,000	$ 540,000	$ (1,900,000)