Summary of Significant Accounting Policies (Assets and Liabilities Held for sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Land		$ 57,117
Buildings and improvements, less accumulated depreciation of $80,543		157,701
Construction in progress		138
Total real estate assets held for sale, net		214,956
Tenant receivables		156
Straight-line rent receivable		12,591
Prepaid expenses and other assets		334
Deferred lease costs, less accumulated amortization of $10,222		10,836
Total other assets held for sale, net	$ 0	23,917
Accounts payable, accrued expenses, and accrued capital expenditures		1,151
Deferred income		1,903
Total liabilities held for sale		3,054
Buildings and improvements, accumulated depreciation		80,543
Deferred lease costs, accumulated amortization		$ 10,222