Goodwill and Other Intangibles (Projected Amortization Expense and Adjustments) (Details) $ in Thousands	Sep. 30, 2015 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Below-market lease liabilities, amortization income, October 1, 2015 - December 31, 2015	$ 5,368
Below-market lease liabilities, amortization income, 2016	21,364
Below-market lease liabilities, amortization income, 2017	21,222
Below-market lease liabilities, amortization income, 2018	20,895
Below-market lease liabilities, amortization income, 2019	20,153
In-Place Leases [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense, October 1, 2015 - December 31, 2015	46,008
Amortization expense, 2016	179,088
Amortization expense, 2017	163,617
Amortization expense, 2018	149,574
Amortization expense, 2019	137,702
Leasing Commissions [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense, October 1, 2015 - December 31, 2015	141
Amortization expense, 2016	547
Amortization expense, 2017	519
Amortization expense, 2018	409
Amortization expense, 2019	382
Above-Market Lease Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense, October 1, 2015 - December 31, 2015	6,716
Amortization expense, 2016	26,797
Amortization expense, 2017	26,450
Amortization expense, 2018	25,887
Amortization expense, 2019	$ 23,925