Receivables and Other Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Receivables and Other Assets [Abstract]
Accounts and other receivables, net	$ 19,595		$ 19,595		$ 13,317
Tenant note receivable	3,202		3,202		3,287
Deferred financing costs, net	11,395		11,395		11,006
Deferred leasing costs, net	12,223		12,223		10,554
Lease inducements, net	762		762		880
Straight-line rent receivables, net	44,861		44,861		39,095
Prepaid expenses, deposits, equipment and other	9,302		9,302		6,831
Derivative financial instruments - interest rate swaps	3,656		3,656		0
Total	104,996		104,996		84,970
Tenant note receivable, interest rate			9.00%
Amortization expense related to deferred leasing costs	686	568	1,844	1,436
Interest expense related to deferred financing costs	805	896	3,030	2,987
Amortization recorded against rental income related to lease inducements	$ 56	$ 54	$ 156	$ 220