Summary of Significant Accounting Policies (Schedule of Intangible Assets) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Above-market ground lease liability
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted- Average Amortization Period	35 years 7 months 20 days
Amortization Expense
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense 2016	$ 10,986
Amortization expense 2017	9,933
Amortization expense 2018	8,976
Amortization expense 2019	8,592
Amortization expense 2020	$ 8,354
Amortization Expense | In-place leases
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted- Average Amortization Period	8 years 10 months 24 days
Amortization expense 2016	$ 10,665
Amortization expense 2017	9,612
Amortization expense 2018	8,655
Amortization expense 2019	8,271
Amortization expense 2020	$ 8,033
Amortization Expense | Other intangible
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted- Average Amortization Period	10 years 6 months
Amortization expense 2016	$ 321
Amortization expense 2017	321
Amortization expense 2018	321
Amortization expense 2019	321
Amortization expense 2020	321
Rental Income
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense 2016	6,018
Amortization expense 2017	5,240
Amortization expense 2018	4,455
Amortization expense 2019	4,070
Amortization expense 2020	3,843
Below market lease amortization income 2016	7,446
Below market lease amortization income 2017	6,660
Below market lease amortization income 2018	5,875
Below market lease amortization income 2019	5,490
Below market lease amortization income 2020	$ 5,250
Rental Income | Above-market lease assets
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted- Average Amortization Period	12 years 4 months 24 days
Amortization expense 2016	$ (1,428)
Amortization expense 2017	(1,420)
Amortization expense 2018	(1,420)
Amortization expense 2019	(1,420)
Amortization expense 2020	$ (1,407)
Rental Income | Below Market Lease
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted- Average Amortization Period	9 years 1 month 6 days
Operating Expense | Above-market ground lease liability
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense 2016	$ (449)
Amortization expense 2017	(449)
Amortization expense 2018	(449)
Amortization expense 2019	(449)
Amortization expense 2020	$ (449)