Plaza Fire Expense (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Plaza Fire Expense (Textual) [Abstract]
Plaza fire reimbursements, net	$ 0	$ 223,000	$ 3,363,000
Expenditures related to fire	6,800,000
Remediation expenditures related to fire	3,700,000
Capital expenditures related to fire	$ 3,100,000