Indebtedness Acquisition Credit Facility (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Mar. 01, 2021	Mar. 25, 2019	Sep. 30, 2016
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 200,000,000
Unamortized Debt Issuance Expense	$ 1,100,000
Indebtedness Weighted Average Remaining Maturity	9 years 5 months
February 2017 facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 200,000,000		$ 90,000,000
Subsequent Event [Member] | February 2017 facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 300,000,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Indebtedness Weighted Average Remaining Maturity	2 years
acquisition facility [Member]
Line of Credit Facility [Line Items]
Unamortized Debt Issuance Expense	$ 200,000
Indebtedness Weighted Average Remaining Maturity	2 years 2 months
Minimum [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Loans Receivable, Basis Spread on Variable Rate	2.75%
Minimum [Member] | Revolving Credit Facility [Member] | February 2017 facility [Member]
Line of Credit Facility [Line Items]
Loans Receivable, Basis Spread on Variable Rate	1.80%
Maximum [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Loans Receivable, Basis Spread on Variable Rate	3.50%
Maximum [Member] | Revolving Credit Facility [Member] | February 2017 facility [Member]
Line of Credit Facility [Line Items]
Loans Receivable, Basis Spread on Variable Rate	2.20%