Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Difference Between Carry Value Of Net Assets And Tax Basis Of Net Assets	$ 1,300,000
Income tax expense	$ (1,089)	$ (1,424)	$ (1,224)
Annual dividends distribution percentage to shareholders to qualify as a REIT	90.00%
Significant temporary differences or tax credits associated with our taxable REIT subsidiaries	$ 0
Uncertain tax positions or unrecognized tax benefits	$ 0
Minimum [Member]
Operating Loss Carryforwards, Expiration Dates	Jan. 01, 2034
Maximum [Member]
Operating Loss Carryforwards, Expiration Dates	Jan. 01, 2037