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Related party transactions - Corporation's equity in PRLP 2011 Holdings, LLC and PR Asset Portfolio 2013-1 International, LLC (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]    
Equity Method Investments $ 236,551 $ 228,072
PRLP 2011 Holding, LLC    
Related Party Transaction [Line Items]    
Equity Method Investments 6,393 6,469
PR Asset Portfolio 2013-1 International, LLC    
Related Party Transaction [Line Items]    
Equity Method Investments $ 3,409 $ 5,794