Goodwill and Other Intangibles (Projected Amortization Expense and Adjustments) (Details) $ in Thousands	Jun. 30, 2016 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Below-market lease liabilities, projected amortization income, July 1, 2016 - December 31, 2016	$ 25,231
Below-market lease liabilities, projected amortization income, 2017	20,340
Below-market lease liabilities, projected amortization income, 2018	20,013
Below-market lease liabilities, projected amortization income, 2019	19,275
Below-market lease liabilities, projected amortization income, 2020	18,082
In-Place Leases [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Projected amortization expense, July 1, 2016 - December 31, 2016	166,779
Projected amortization expense, 2017	152,212
Projected amortization expense, 2018	139,390
Projected amortization expense, 2019	127,892
Projected amortization expense, 2020	119,201
Leasing Commissions [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Projected amortization expense, July 1, 2016 - December 31, 2016	968
Projected amortization expense, 2017	971
Projected amortization expense, 2018	783
Projected amortization expense, 2019	709
Projected amortization expense, 2020	668
Above-Market Lease Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Projected amortization expense, July 1, 2016 - December 31, 2016	25,578
Projected amortization expense, 2017	25,193
Projected amortization expense, 2018	24,658
Projected amortization expense, 2019	22,703
Projected amortization expense, 2020	$ 22,236