Receivables and Other Assets - Schedule of Receivables and Other Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Receivables and Other Assets [Abstract]
Tenant receivables, net	$ 8,639	$ 11,896
Other receivables, net	7,090	5,539
Deferred financing costs, net	14,753	16,929
Deferred leasing costs, net	17,566	17,281
Straight-line rent receivables, net	63,427	56,433
Prepaid expenses, deposits, equipment and other, net	36,972	34,314
Derivative financial instruments - interest rate swaps	0	1,714
Total	$ 148,447	$ 144,106