Equity (Operating LLC Membership Units) (Details)	9 Months Ended
	Sep. 30, 2018 shares
Membership Units Received Net Of Surrenders	(330,450)
Unit Issuance And Surrender Agreement [Member]
Membership Units Received Net Of Surrenders	247,120
Retirement of Common Stock [Member]
Membership Units Received Net Of Surrenders	(577,570)