Fee and Other Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Fee and Other Income [Abstract]
Tenant cleaning fees	$ 16,982	$ 15,409	$ 32,492	$ 30,832
Management and leasing fees	4,546	7,376	9,300	11,887
Lease termination fees	479	6,499	890	7,675
Other income	11,048	11,578	23,662	24,654
Management fee income from Interstate Properties	192	194	391	391
Fee and other income	$ 33,055	$ 40,862	$ 66,344	$ 75,048