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Related party transactions - Proportionate share of income (loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
PRLP 2011 Holding, LLC    
Related Party Transaction [Line Items]    
Share of (loss) income from equity method investments $ (1,030) $ (120)
PR Asset Portfolio 2013-1 International, LLC    
Related Party Transaction [Line Items]    
Share of (loss) income from equity method investments $ 324 $ 296