Debt Obligations - Schedule of Debt Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Obligations
Deferred financing costs	$ (6,872)	$ (6,646)
Total debt obligations, net of deferred costs	892,385	808,860
Mortgages payable
Debt Obligations
Total debt obligations, net of deferred costs	852,857	778,106
Deferred financing costs	(6,448)	(6,289)
Junior subordinated notes
Debt Obligations
Total debt obligations, net of deferred costs	37,400	37,400
Deferred financing costs	(347)	(357)
Credit facility
Debt Obligations
Total debt obligations, net of deferred costs	$ 9,000	$ 0