Goodwill and Other Intangibles (Intangible Lease Assets and Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Intangible lease liabilities, accumulated amortization	$ 38,240	$ 19,123
Below-market lease, Weighted-Average Useful Life	16 years 9 months 29 days
Intangible lease liabilities, net	$ 251,692	317,838
Total Intangible Lease Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible lease assets, accumulated amortization	446,800
Intangible lease assets, net	1,800,000	2,175,982
In-Place Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible lease assets, accumulated amortization	$ 398,770	236,096
Intangible lease assets, Weighted-Average Useful Life	13 years 7 months 2 days
Intangible lease assets, net	$ 1,458,354	1,816,508
Leasing Commissions [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible lease assets, accumulated amortization	$ 1,035	505
Intangible lease assets, Weighted-Average Useful Life	9 years 1 month 2 days
Intangible lease assets, net	$ 4,872	4,205
Above-Market Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible lease assets, accumulated amortization	$ 47,041	22,471
Intangible lease assets, Weighted-Average Useful Life	16 years 18 days
Intangible lease assets, net	$ 308,306	$ 355,269