Receivables and Other Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Receivables and Other Assets [Abstract]
Accounts and other receivables, net	$ 23,749		$ 23,749		$ 22,847
Tenant note receivable	3,080		3,080		3,173
Deferred financing costs, net	12,418		12,418		10,921
Deferred leasing costs, net	16,616		16,616		13,500
Lease inducements, net	807		807		771
Straight-line rent receivables, net	54,057		54,057		47,317
Prepaid expenses, deposits, equipment and other, net	27,544		27,544		6,683
Derivative financial instruments - interest rate swaps	3,290		3,290		5,073
Total	141,561		141,561		110,285
Amortization expense related to deferred leasing costs	957	686	2,646	1,862
Interest expense related to deferred financing costs	724	805	2,319	3,084
Amortization recorded against rental income related to lease inducements	$ 50	$ 56	$ 168	$ 173