Subsequent Events (Details) $ in Thousands	1 Months Ended	3 Months Ended
	May 07, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) property	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Subsequent Event [Line Items]
Proceeds from sales of operating properties			$ 13,098	$ 61,637
Liabilities of assets held for sale			$ 2,408		$ 0
Various Properties In Georgia, Wisconsin and Florida
Subsequent Event [Line Items]
Number of properties in disposal group | property			4
Assets held for sale			$ 111,500
Liabilities of assets held for sale			$ 36,200
Various Properties In Georgia, Wisconsin and Florida | Subsequent Event
Subsequent Event [Line Items]
Proceeds from sales of operating properties	$ 121,300
Various Properties In Georgia, Wisconsin and Florida | Forecast
Subsequent Event [Line Items]
Disposal group, not discontinued operation, gain (loss) on disposal		$ 13,600