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Commitments and Contingencies - Legacy Corner Apartments (Details) - USD ($)		3 Months Ended	12 Months Ended
	Apr. 12, 2017	Sep. 30, 2017	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Loss contingency accrual				$ 3,000,000
Compensatory Damages [Member]
Loss Contingencies [Line Items]
Damages awarded	$ 6,000,000
Punitive Damages [Member]
Loss Contingencies [Line Items]
Damages awarded	6,000,000
Legacy Corner Apartments Litigation [Member]
Loss Contingencies [Line Items]
Loss contingency accrual				$ 3,000,000	$ 0
Estimate of possible loss	$ 6,000,000
Loss contingency accrual, period increase (decrease)		$ 2,447,000
Loss contingency accrual, payments			$ 553,000

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