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Related party transactions - Proportionate share of income (loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]    
Share of (loss) income from equity method investments $ 43,000 $ 38,000
PRLP 2011 Holding, LLC    
Related Party Transaction [Line Items]    
Share of (loss) income from equity method investments (163) (356)
PR Asset Portfolio 2013-1 International, LLC    
Related Party Transaction [Line Items]    
Share of (loss) income from equity method investments $ 231 $ (5,073)