Description of Business and Basis of Presentation (Recently Issued Accounting Standards) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Jan. 01, 2019	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capitalized indirect leasing costs	$ 3,800	$ 3,000
Weighted average discount rate			4.50%	4.49%
Cumulative effect of change in accounting principle					$ 22,329
Distributions in Excess of Cumulative Net Income
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting principle					22,329
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right of use asset				$ 56,300
Lease liability				$ 56,300
Accounting Standards Update 2017-05 | Distributions in Excess of Cumulative Net Income
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting principle					$ 22,300