Accruals and Other Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Accrued and Other Liabilities [Abstract]
Beginning balance			$ 11,030	$ 4,154	$ 4,154
Income attributable to noncontrolling interests	$ 2,545	$ 2,214	3,442	3,097	15,375
Distributions made			(8,927)	$ (3,840)	(8,865)
Other			(716)		366
Ending balance	$ 4,829		$ 4,829		$ 11,030