Identified Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets and Liabilities
Gross amount	$ 400,061	$ 415,261
Accumulated amortization	(207,330)	(187,360)
Net	192,731	227,901
Gross amount	586,969	643,488
Accumulated amortization	(323,183)	(325,340)
Net	263,786	318,148
Below Market Leases Net Of Above Market Leases
Finite-Lived Intangible Assets and Liabilities
Amortization of Intangible Assets	53,202	78,749	$ 37,516
2017	45,576
2018	44,346
2019	32,168
2020	23,343
2021	18,159
Other Identified Intangible Assets
Finite-Lived Intangible Assets and Liabilities
Amortization of Intangible Assets	29,543	36,659	28,275
2017	24,456
2018	20,201
2019	15,863
2020	12,394
2021	11,177
Tenant Under Ground Leases
Finite-Lived Intangible Assets and Liabilities
Amortization of Intangible Assets	1,832	$ 1,832	$ 1,832
2017	1,832
2018	1,832
2019	1,832
2020	1,832
2021	$ 1,832