Commitments and Contingencies (Details) - USD ($) $ in Millions	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 50.0
Letters of Credit Outstanding, Amount		$ 12.5	$ 9.4
Subsequent Event [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase Commitment, Remaining Minimum Amount Committed	$ 18.1
Town And Country Shopping Center [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent		35.00%
Maximum [Member] | Town And Country Shopping Center [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent		16.62%