Newly Issued Accounting Pronouncements (Details) $ in Thousands		12 Months Ended
	Jan. 01, 2019 USD ($) center administrative_office capital_lease	Dec. 31, 2019 USD ($) center	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2020 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Real estate taxes, net		$ 60,813	$ 69,268	$ 75,636
Number of properties subject to ground leases | center	12
Number of administrative office leases | administrative_office	4
Number of finance leases | capital_lease	1
Finance lease assets, number of units, centers | center	2	2
Finance lease obligations	$ 21,900	$ 21,804
Operating leases, liabilities		43,063
Other, net		$ 188,004	160,178
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset	44,200
Operating leases, liabilities	$ 42,900
Accounting Standards Update 2016-13 [Member] | Subsequent Event [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings (accumulated deficit)					$ (700)
Other, net					$ (700)
Lease Arrangement, Lessor [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Real estate taxes, net			$ 4,300	$ 4,600