Summary of Significant Accounting Policies - Schedule of Real Estate Properties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Real Estate Properties [Line Items]
Total Depreciable Assets	$ 3,332,021	$ 3,333,900
Land
Real Estate Properties [Line Items]
Total Depreciable Assets	406,271	412,578
Buildings and garages
Real Estate Properties [Line Items]
Total Depreciable Assets	$ 2,519,587	2,535,757
Estimated Useful Life	40 years
Building improvements
Real Estate Properties [Line Items]
Total Depreciable Assets	$ 57,381	52,715
Building improvements | Maximum
Real Estate Properties [Line Items]
Estimated Useful Life	40 years
Building improvements | Minimum
Real Estate Properties [Line Items]
Estimated Useful Life	7 years
Tenant improvements
Real Estate Properties [Line Items]
Total Depreciable Assets	$ 348,782	$ 332,850