Intangible Assets Intangible Assets, Schedule of Intangible Asset Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 3,754	$ 4,321	$ 11,370	$ 8,897
Ground Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	257	368	771	368
Leases, Acquired-in-Place [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	3,478	3,824	10,322	8,142
Franchise Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 19	$ 129	$ 277	$ 387