Annual report pursuant to Section 13 and 15(d)

Rentals Under Operating Leases (Details)

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Rentals Under Operating Leases (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Rentals Under Operating Leases [Abstract]      
2013 $ 212,828    
2014 179,735    
2015 152,282    
2016 124,434    
2017 100,573    
Thereafter 243,247    
Operating Leases, Future Minimum Payments Receivable 1,013,099    
Percentage Rents 150 193 140
Reimbursement income $ 29,166 $ 25,680 $ 23,998