Intangible Assets and Below Market Lease Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Assets:
Deferred leasing costs (including lease incentives and above market lease and in-place lease acquisition-related intangible assets)	$ 352,289		$ 353,581
Deferred leasing costs, accumulated amortization	(142,148)		(140,081)
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	210,141		213,500
Liabilities (in accounts payable, accrued expenses and other liabilities):
Acquisition-related below market lease liabilities, gross	61,049		61,221
Acquisition-related below market lease liabilities, accumulated amortization	(24,482)		(23,074)
Acquisition-related below market lease liabilities, net	36,567		$ 38,147
Deferred Leasing Costs and Acquisition-Related Intangible Assets (in Depreciation and Amortization) [Member]
Assets:
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	191,574
Amortization of intangible assets and below market lease liabilities [Abstract]
Amortization of intangible assets	10,619	$ 11,335
Lease Incentives (in Rental and Other Revenues) [Member]
Assets:
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	8,244
Amortization of intangible assets and below market lease liabilities [Abstract]
Amortization of intangible assets	397	711
Acquisition-Related Intangible Assets (in Rental and Other Revenues) [Member]
Assets:
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	8,280
Amortization of intangible assets and below market lease liabilities [Abstract]
Amortization of intangible assets	1,036	1,031
Acquisition-Related Intangible Assets (in Rental Property and Other Expenses) [Member]
Assets:
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	2,043
Amortization of intangible assets and below market lease liabilities [Abstract]
Amortization of intangible assets	137	138
Acquisition-Related Below Market Lease Liabilities (in Rental and Other Revenues) [Member]
Liabilities (in accounts payable, accrued expenses and other liabilities):
Acquisition-related below market lease liabilities, net	36,567
Amortization of intangible assets and below market lease liabilities [Abstract]
Amortization of acquisition-related below market lease liabilities	$ (1,580)	$ (1,772)