Related Party Arrangements - Origination of Mezzanine Loan (Narrative) (Details) - USD ($)	1 Months Ended
	Jul. 31, 2015	Jun. 30, 2019
Related Party Transaction [Line Items]
VIE carrying value		$ 288,900,000
Mezzanine loans
Related Party Transaction [Line Items]
VIE carrying value	$ 75,000,000
Mezzanine loans | Espresso
Related Party Transaction [Line Items]
Fixed rate	10.00%