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Related Party Arrangements - Origination of Mezzanine Loan (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jul. 31, 2015
Dec. 31, 2015
Mezzanine loans    
Related Party Transactions [Line Items]    
Fixed Rate   10.00%
Espresso Joint Venture    
Related Party Transactions [Line Items]    
VIE carrying value   $ 41.9
Espresso Joint Venture | Mezzanine loans    
Related Party Transactions [Line Items]    
VIE carrying value $ 75.0  
Fixed Rate 10.00%